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B1 noun #7,000 mais comum 10 min de leitura

脱水

dassui Top 7,000

Pratique Exemplos Notas e dicas 脱水 em 30 segundos

Explicação 脱水 in your Level:

At the A1 level, you only need to know that **脱水 (dassui)** means 'no water in the body' or 'the spin button on the washing machine.' If you are in Japan and you feel very sick because of the heat, you can say 'dassui' to help people understand you need water. On a washing machine, look for these characters: **脱水**. It is the part of the wash that makes the clothes less wet before you hang them up. You don't need to worry about complex grammar yet; just recognize the word in these two places: at home and in the summer heat.

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At the A2 level, you can start using **脱水** in simple sentences. You should know that it is a noun that can become a verb by adding 'suru' (**脱水する**). For example, 'Sentakuki de dassui suru' (Spin-dry in the washing machine). You should also recognize the phrase **脱水症状 (dassui shoujou)**, which means 'dehydration symptoms.' If you go hiking or play sports, someone might ask, 'Dassui ni nattemasen ka?' (Are you dehydrated?). You can answer 'Daijoubu desu' (I'm okay) or 'Mizu o nomimasu' (I'll drink water).

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As a B1 learner, you should understand the nuance between **脱水 (dassui)** and **乾燥 (kansō)**. You use 'dassui' for the mechanical process of spinning water out of clothes or the medical condition of losing body fluids. You use 'kansō' for things being dry like the air or skin. You should be comfortable using compounds like **脱水機 (dassuiki - dehydrator/spin-dryer)** and **脱水状態 (dassui jōtai - state of dehydration)**. You should also be able to understand weather reports that warn about dehydration during the Japanese summer and know that it's a 'Suru-verb' that can take objects or describe states.

At the B2 level, you should be able to use **脱水** in more formal or technical discussions. This includes understanding its role in chemistry (dehydration reactions) or industrial processes. You should know common collocations like **脱水症状を引き起こす (to cause dehydration symptoms)** or **脱水が不十分 (insufficient spin-drying)**. You should also be aware of the register; 'dassui' is a kango (Sino-Japanese word), making it sound more formal and precise than 'mizu ga nai' or 'nodo ga kawaita.' You can use it in written reports or professional medical/fitness contexts.

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At the C1 level, you should have a nuanced command of **脱水** in various professional fields. In a medical context, you would understand the difference between isotonic, hypotonic, and hypertonic dehydration (though the specific terms might be more specialized, 'dassui' is the root). You should recognize the word in classical or literary contexts where it might be used metaphorically, although this is rare. You should be able to explain the mechanical principles of a 'dassuiki' (centrifugal force) using the word and discuss public health policies regarding heatstroke and dehydration prevention in Japan.

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At the C2 level, **脱水** is a tool for precise communication in science, medicine, and engineering. You can discuss the 'dehydration synthesis' of polymers or the 'dassui' processes in wastewater treatment plants with ease. You understand the historical evolution of the kanji and can differentiate 'dassui' from highly specific synonyms like 'koshitsu' (parching). You can use the word in high-level academic writing or when interpreting for medical professionals, ensuring that the distinction between 'fluid volume deficit' and 'simple thirst' is maintained through the correct use of this term and its related compounds.

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Pratique Exemplos Notas e dicas

脱水 em 30 segundos

脱水 (Dassui) means dehydration or the removal of water.
Commonly used for medical dehydration and washing machine spin cycles.
Often combined with 'suru' to act as a verb meaning 'to spin-dry'.
Essential for understanding Japanese summer health warnings and appliance labels.

The Japanese word 脱水 (dassui) is a versatile noun that primarily translates to "dehydration" or "water removal." While in English we might use different words for medical dehydration and the spin cycle of a washing machine, Japanese uses this single, powerful term to cover both physical physiology and domestic chores. The first kanji, 脱 (datsu), signifies shedding, removing, or escaping, while the second, 水 (sui), is the universal symbol for water. Together, they create a concept of water being forcibly or naturally removed from a system.

Medical Context: In a healthcare or sports setting, 脱水 usually refers to 脱水症状 (dassui shōjō), or dehydration symptoms. You will hear this constantly during the sweltering Japanese summers (mushi-atsui), where heatstroke warnings (netsuchūshō keikai) are broadcast daily. Doctors use it to describe the physiological state where the body's output of fluids exceeds its intake, leading to electrolyte imbalances.
Domestic/Laundry Context: When you use a Japanese washing machine, you will see a button labeled 脱水. This does not mean the machine is thirsty; it refers to the spin-dry cycle. It is the process of using centrifugal force to remove excess water from clothes after they have been washed and rinsed. Understanding this is crucial for anyone living in Japan, as you may want to run an extra 'dassui' cycle on a rainy day to ensure your clothes dry faster indoors.

夏の暑い日は、こまめに水分を補給して脱水を防ぎましょう。
— Translation: On hot summer days, let's replenish fluids frequently to prevent dehydration.

Beyond these two common uses, the term appears in chemistry and industrial engineering. In chemistry, a 脱水反応 (dassui hannō) is a dehydration reaction where a water molecule is removed from the reactant. In industrial settings, it might refer to the removal of water from sludge or mineral ores. Despite these technical applications, for a B1 learner, focusing on the health and laundry aspects will cover 95% of daily encounters with the word.

洗濯機の脱水機能が壊れてしまった。
— Translation: The spin-dry function of the washing machine has broken.

Etymological Breakdown: The kanji 脱 is composed of the 'flesh' radical (月) and a phonetic component (兌). It implies a separation from the body or a core state. When paired with 水, it literally paints a picture of 'water leaving the body' or 'water leaving the object.' This logical pairing makes the word easy to remember once you recognize the individual components.

激しい下痢で脱水状態に陥った。
— Translation: I fell into a state of dehydration due to severe diarrhea.

In summary, whether you are reading a medical report, listening to a weather forecast, or simply doing your laundry in a Tokyo apartment, 脱水 is an essential term that bridges the gap between biological survival and everyday convenience.

Using 脱水 (dassui) correctly requires understanding its grammatical flexibility as a Suru-verb noun. While it is a noun, it frequently combines with する (suru) to form a verb meaning "to dehydrate" or "to spin-dry." Additionally, it is often part of compound nouns that specify the condition or the equipment involved.

The 'Suru' Verb Form: When you say 脱水する (dassui suru), the meaning depends on the subject. If the subject is a person, it usually means they are losing water (often used in medical or sports contexts). If the subject is a machine, it means the machine is performing its water-removal cycle.

Example: 「この服は手洗いしてから、短時間だけ脱水してください。」 (Please hand-wash these clothes and then spin-dry them for just a short time.)
The 'State' Form (Condition): To describe someone who is currently dehydrated, we use 脱水状態 (dassui jōtai) meaning "state of dehydration" or 脱水症状 (dassui shōjō) meaning "dehydration symptoms."

Example: 「彼は脱水症状で病院に運ばれた。」 (He was taken to the hospital with dehydration symptoms.)

マラソン大会の後、多くのランナーが脱水に苦しんだ。
— Translation: After the marathon, many runners suffered from dehydration.

In a technical or scientific context, you might see 脱水機 (dassuiki), which refers to a dehydrator or a spin-dryer. In a laboratory, this could be a centrifuge; in a kitchen, it could be a salad spinner (though 'sarada supinnā' is more common for the kitchen tool). Understanding the suffix 機 (ki) for machine helps you identify the physical object.

この洗濯機は脱水の時の音がうるさい。
— Translation: This washing machine is loud during the spin cycle.

Common Phrasal Patterns

脱水をかける (dassui o kakeru): To start the spin cycle (literally 'to apply dehydration').
脱水を防ぐ (dassui o fusegu): To prevent dehydration.
軽度の脱水 (keido no dassui): Mild dehydration.
重度の脱水 (jūdo no dassui): Severe dehydration.

お酒を飲みすぎると、体内の水分が失われて脱水しやすくなります。
— Translation: If you drink too much alcohol, body fluids are lost and you become prone to dehydration.

Whether you are giving advice to a friend who is hiking or managing your household chores, the key to using 脱水 is recognizing whether you are talking about a biological state or a mechanical action. The grammar remains remarkably consistent across both domains.

The word 脱水 (dassui) is not just a textbook term; it is deeply embedded in the daily sensory experience of living in Japan. From the high-pitched beeps of a laundry machine to the urgent warnings on a summer television broadcast, you will encounter this word in several specific environments.

1. The Japanese Summer (Natsu): Japan's summers are notoriously humid and hot. During July and August, the word 脱水 appears everywhere. You will see it on digital signage in subways, on the labels of electrolyte beverages in vending machines, and in morning news segments. Weather forecasters use the term 脱水注意報 (dassui chūihō) or "dehydration advisory" alongside heatstroke warnings. It is a word that carries a sense of urgency and public safety.
2. The Coin Laundry and Home Laundry: If you visit a コインランドリー (koin randorī), you will see the kanji 脱水 on the control panels. Because Japanese apartments often lack space for large dryers, the efficiency of the 'dassui' (spin) cycle is highly valued. People often talk about how long they should 'dassui' certain fabrics to prevent wrinkles while still removing enough water to allow for air-drying on a balcony.

「熱中症のサインは、めまいや脱水感です。すぐに涼しい場所へ移動しましょう。」
— Translation: Signs of heatstroke include dizziness and a feeling of dehydration. Move to a cool place immediately.

In the world of sports, coaches and trainers are constantly monitoring their athletes for 脱水. At a marathon or a school sports day (undōkai), you will hear announcements reminding participants to take 'suibun hokyū' (fluid replenishment) to avoid falling into a 'dassui' state. It is a term of care and caution in these contexts.

「洗濯機の脱水が終わったら、すぐに干さないとシワになりますよ。」
— Translation: If you don't hang the clothes up immediately after the spin cycle ends, they will get wrinkled.

3. Medical and Caregiving Facilities: In hospitals and elderly care homes (kaigo shisetsu), 脱水 is a critical focus. Nurses monitor 'nyō' (urine) color and frequency as indicators of 'dassui'. You might hear a nurse say, 「少し脱水気味ですね」 (You're looking a bit dehydrated), where the suffix 気味 (gimi) adds the nuance of "a tendency toward" or "slightly."

By paying attention to these contexts, you'll realize that 脱水 is a word that connects the physiological needs of the body with the mechanical needs of the household, making it a truly essential part of the Japanese linguistic landscape.

While 脱水 (dassui) is a straightforward term, English speakers and other learners often run into specific pitfalls when using it. These mistakes usually stem from over-extending the word's meaning or confusing it with similar-sounding or similar-meaning words.

Mistake 1: Confusing 'Dassui' with 'Kansō' (Drying): This is the most frequent error. In English, we might say "I'm drying the clothes" for both the spin cycle and the heat cycle. In Japanese, 脱水 (dassui) is specifically the mechanical removal of liquid water (spinning), while 乾燥 (kansō) is the evaporation of moisture (using heat or air).

Wrong: 「洗濯機で服を脱水して、乾かした。」 (Technically okay, but 'dassui' doesn't mean the clothes are dry yet.)
Correct: 「脱水のあと、乾燥機に入れました。」 (After the spin cycle, I put them in the dryer.)
Mistake 2: Using 'Dassui' for 'Thirsty': If you are just a little thirsty, do not say 「私は脱水です」 (I am dehydration). This sounds like a medical diagnosis.

Wrong: 「脱水だから、水が飲みたい。」
Correct: 「喉が渇いたから、水が飲みたい。」 (I'm thirsty, so I want to drink water.)
Use 脱水 only when you are referring to the physiological condition of being dangerously low on fluids.

❌ 喉が渇いたので、脱水しました。
✅ 喉が渇いたので、水分を補給しました。
— Note: You don't 'do' dehydration to yourself as a response to thirst!

Another mistake involves the word 下水 (gesui) which means sewage. Because both words end in 水 (sui) and relate to water leaving a system, beginners sometimes swap them. Telling someone you have 'gesui' (sewage) instead of 'dassui' (dehydration) will lead to some very confused looks!

❌ この野菜を乾燥してください（Spinning laundry context）。
✅ この洗濯物を脱水してください。
— Note: Use 'dassui' for the spin cycle, 'kansō' for the heat/dry cycle.

Lastly, remember that 脱水 is a noun. While you can say 脱水する, it is very common to use it as a modifier: 脱水症状 (dassui shōjō). Forgetting the 症状 (shōjō - symptoms) when talking to a doctor might make your Japanese sound a bit clipped or overly technical.

To truly master 脱水 (dassui), you need to understand where it sits in the constellation of water-related Japanese vocabulary. There are several words that overlap in meaning, and choosing the right one depends entirely on the context—whether it's biological, environmental, or mechanical.

1. 脱水 vs. 水分不足 (Suibun busoku): 脱水 is a more formal, medical term for dehydration. 水分不足 (suibun busoku) literally means "insufficient moisture/water."

Comparison: Use 脱水 when talking to a doctor or describing a serious health state. Use 水分不足 when talking about your skin being dry, a plant needing water, or a general feeling of not having drunk enough water today.
2. 脱水 vs. 乾燥 (Kansō): As mentioned in the mistakes section, 脱水 is about removing liquid water (spinning/shedding). 乾燥 is about the state of being dry (humidity/evaporation).

Comparison: A washing machine does 脱水. A clothes dryer or the winter air causes 乾燥.

「肌が乾燥している」 (My skin is dry - environmental)
「体が脱水している」 (My body is dehydrated - medical)

3. 脱水 vs. 渇き (Kawaki): 渇き (kawaki) refers to the sensation of thirst or a spiritual/emotional longing. 脱水 is the physical reality of water loss.

Comparison: You feel 喉の渇き (nodo no kawaki) - thirst in the throat. You suffer from 脱水症状.

「知識への渇き」 (Thirst for knowledge - metaphorical)
「洗濯物の脱水」 (Spin-drying laundry - literal)

In chemical contexts, you might encounter 脱液 (datsueki), which is the removal of any liquid (not just water), but 脱水 remains the standard for water-specific processes. For B1 learners, mastering the distinction between 脱水, 乾燥, and 水分不足 will provide a solid foundation for describing most situations involving water loss or dryness.

How Formal Is It?

Curiosidade

The kanji '脱' also appears in 'datsui-jo' (changing room), meaning a place to 'shed' your clothes. 'Dassui' is effectively 'shedding' water.

Guia de pronúncia

UK dæsˈsuːi

US dɑːˈsuːi

Atamadaka (Type 1) - High on the first syllable 'DA', then dropping for 'ssui'.

Rima com

Hassui (Water repellent) Gessui (Monthly) Kassui (Water shortage) Nissui (Japanese Fisheries company) Bassui (Excerpt) Kessui (Determination) Tessui (Iron hammer) Sassui (Sprinkling water)

Erros comuns

Pronouncing it as 'dasui' without the double 's' (forgetting the small 'tsu').
Confusing the pitch with 'dassui' as a flat tone.
Mispronouncing the 'u' as a rounded English 'oo' instead of the unrounded Japanese 'u'.
Swapping 'dassui' with 'dasui' (a different, less common word).
Confusing with 'dassai' (a famous sake brand).

Nível de dificuldade

Leitura 3/5

The kanji are standard but the first one is slightly complex for beginners.

Escrita 4/5

Writing '脱' correctly requires attention to the radical and stroke order.

Expressão oral 2/5

Short and easy to say, provided you get the small 'tsu' right.

Audição 2/5

Clear pronunciation, though it can be confused with other 'sui' words.

O que aprender depois

Pré-requisitos

水 (Water) 出る (To go out) 洗濯機 (Washing machine) 暑い (Hot) 症状 (Symptom)

Aprenda a seguir

乾燥 (Dryness) 熱中症 (Heatstroke) 補給 (Replenishment) 機能 (Function) 状態 (State)

Avançado

浸透圧 (Osmotic pressure) 電解質 (Electrolyte) 縮合反応 (Condensation reaction) 遠心分離 (Centrifugation) 経口補水療法 (Oral rehydration therapy)

Gramática essencial

Suru-Verbs (Noun + する)

洗濯物を脱水する。

Noun Modifying Noun (Noun + の + Noun)

脱水の時間。

Compound Nouns (Noun + Noun)

脱水症状。

Potential Form of Suru (できる)

この服は脱水できない。

State Change (Noun + になる)

脱水になる。

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Exemplos por nível

洗濯機の脱水ボタンを押してください。

Please press the spin-dry button on the washing machine.

脱水 (dassui) acts as a noun modifying 'button'.

脱水にならないように、水を飲みます。

I drink water so I don't get dehydrated.

脱水になる (dassui ni naru) means 'to become dehydrated'.

これは脱水機です。

This is a spin-dryer.

脱水機 (dassuiki) is a compound noun.

脱水、お願いします。

Spin-dry, please.

Simple noun + please (onegai shimasu).

暑いから脱水が怖いです。

It's hot, so I'm afraid of dehydration.

脱水 is the subject of the fear.

脱水は5分です。

The spin cycle is 5 minutes.

Stating the duration of the process.

彼は脱水ですか？

Is he dehydrated?

Simple question using the noun.

脱水、終わりました。

The spin cycle has finished.

Process completion.

スポーツの後は脱水になりやすいです。

It is easy to become dehydrated after sports.

V-stem + やすい (yasui) means 'easy to...'

洗濯物を1分だけ脱水しました。

I spin-dried the laundry for just one minute.

脱水する (dassui suru) used as a verb.

脱水症状に気をつけてください。

Please be careful of dehydration symptoms.

気をつける (ki o tsukeru) means 'to be careful'.

この服は脱水できません。

These clothes cannot be spin-dried.

Potential negative form of 'suru'.

脱水が終わったら教えてください。

Please let me know when the spin cycle is over.

Temporal clause using 'tara'.

赤ちゃんが脱水にならないか心配です。

I'm worried the baby might get dehydrated.

～ないか心配 (nai ka shinpai) means 'worried whether... not'.

脱水機を使って水を切ります。

I use a spin-dryer to drain the water.

Using the instrument particle 'te'.

脱水が強すぎて服が傷んだ。

The spin cycle was too strong and damaged the clothes.

～すぎる (sugiru) means 'too much'.

激しい運動で、彼は軽い脱水状態になった。

Due to intense exercise, he fell into a state of mild dehydration.

状態 (jōtai) adds the nuance of 'physical state'.

この全自動洗濯機は、脱水の音がとても静かだ。

This fully automatic washing machine is very quiet during the spin cycle.

脱水の音 (dassui no oto) - possessive use.

脱水を防ぐために、塩分も摂取したほうがいい。

To prevent dehydration, it's better to also consume salt.

～ために (tame ni) expresses purpose.

お年寄りは喉の渇きを感じにくく、脱水になりやすい。

Elderly people don't easily feel thirst and are prone to dehydration.

V-stem + にくい (nikui) means 'difficult to...'

手洗いしたセーターをバスタオルに包んで脱水する。

Wrap the hand-washed sweater in a bath towel to spin-dry it (manually).

Describing a specific method of water removal.

下痢や嘔吐が続くと、すぐに脱水症状が現れる。

If diarrhea and vomiting continue, dehydration symptoms appear quickly.

現れる (arawareru) means 'to appear'.

脱水時間は30秒程度で十分です。

A spin time of about 30 seconds is sufficient.

程度 (teido) means 'approximately'.

雨の日は脱水を長めにかけると乾きが早い。

On rainy days, if you run the spin cycle longer, they dry faster.

長めに (nagame ni) means 'slightly longer'.

高温多湿の環境下では、自覚症状がないまま脱水が進むことがある。

In high-temperature and high-humidity environments, dehydration can progress without subjective symptoms.

～たまま (ta mama) means 'remaining in a state'.

工業用脱水機を用いて、汚泥から水分を分離する。

Using an industrial dehydrator, water is separated from the sludge.

用いて (mochiite) is a formal version of 'using'.

脱水反応によって、二つの分子が結合し、水分子が放出される。

Through a dehydration reaction, two molecules bond and a water molecule is released.

～によって (ni yotte) indicates the means or cause.

この素材はデリケートなので、脱水機は使用せず、形を整えて干してください。

This material is delicate, so please do not use a spin-dryer; shape it and hang it up.

～せず (sezu) is the formal negative of 'suru'.

重度の脱水に陥ると、意識障害を引き起こす危険性がある。

If one falls into severe dehydration, there is a risk of causing impaired consciousness.

陥る (ochiiru) means 'to fall into (a bad state)'.

経口補水液は、脱水状態の回復に非常に効果的だ。

Oral rehydration solutions are very effective for recovering from a state of dehydration.

回復 (kaifuku) means recovery.

洗濯物の偏りが原因で、脱水中に大きな振動が発生した。

Due to the laundry being unbalanced, large vibrations occurred during the spin cycle.

偏り (katayori) means imbalance or bias.

細胞の脱水が進むと、代謝機能が著しく低下する。

As cellular dehydration progresses, metabolic functions decline remarkably.

著しく (ichijirushiku) means remarkably or significantly.

砂漠地帯での遭難において、最大の脅威は脱水による衰弱である。

In cases of being stranded in desert regions, the greatest threat is weakness caused by dehydration.

遭難 (sōnan) means 'getting lost/disaster'.

遠心脱水機の回転速度を調整することで、含水率を制御する。

By adjusting the rotation speed of the centrifugal dehydrator, the moisture content is controlled.

含水率 (gansuiritsu) means moisture content.

アルコールには利尿作用があるため、過度の飲酒は脱水を助長する。

Since alcohol has a diuretic effect, excessive drinking promotes dehydration.

助長する (jochō suru) means to promote or aggravate a negative trend.

この化学合成プロセスでは、触媒を用いて脱水縮合を促進させる。

In this chemical synthesis process, a catalyst is used to promote dehydration condensation.

脱水縮合 (dassui shukugō) is a specific chemical term.

震災時、断水によって衛生環境が悪化し、二次的に脱水患者が増加した。

During the earthquake disaster, the hygiene environment deteriorated due to water suspension, and dehydration patients increased secondarily.

二次的に (nijiteki ni) means secondarily.

血液濃縮は、体内の水分喪失に伴う脱水の指標の一つとなる。

Hemoconcentration serves as one of the indicators of dehydration accompanying the loss of body fluids.

に伴う (ni tomonau) means 'accompanying'.

製品の品質を維持するため、真空脱水技術が採用されている。

To maintain product quality, vacuum dehydration technology is employed.

採用 (saiyō) means adoption/employment.

熱帯夜における就寝中の脱水は、脳梗塞のリスクを高める要因となる。

Dehydration during sleep on tropical nights becomes a factor that increases the risk of cerebral infarction.

要因 (yōin) means primary factor.

生体内の恒常性を維持する機構が、重篤な脱水によって破綻を来す。

The mechanism that maintains homeostasis within a living body breaks down due to serious dehydration.

破綻を来す (hatan o kitasu) is a high-level phrase meaning 'to cause a collapse'.

汚泥処理における機械式脱水は、環境負荷低減の観点から極めて重要である。

Mechanical dehydration in sludge treatment is extremely important from the perspective of reducing environmental load.

観点 (kanten) means 'perspective' or 'viewpoint'.

当該化合物は、加熱による脱水反応を経て、安定した酸化物へと相転移する。

The compound in question undergoes a phase transition to a stable oxide via a dehydration reaction through heating.

経て (hete) means 'via' or 'after passing through'.

脱水に伴う電解質バランスの崩れは、多臓器不全を誘発する恐れがある。

The disruption of electrolyte balance accompanying dehydration may induce multiple organ failure.

誘発する (yūhatsu suru) means to induce or trigger.

高分子化合物の重合課程において、脱水は反応効率を左右する鍵となる工程だ。

In the polymerization process of polymer compounds, dehydration is a key step that influences reaction efficiency.

左右する (sayū suru) means to influence or govern.

都市インフラの老朽化により、漏水と並んで効率的な脱水システムの再構築が急務となっている。

Due to the aging of urban infrastructure, the reconstruction of efficient dehydration systems, alongside water leakage issues, has become an urgent task.

急務 (kyūmu) means urgent business/task.

細胞外液の浸透圧上昇が、細胞内からの脱水を惹起し、細胞萎縮を招く。

An increase in the osmotic pressure of the extracellular fluid provokes dehydration from within the cells, leading to cell atrophy.

惹起する (jakki suru) is a very formal term for 'to cause/provoke'.

極限環境下での生理学的研究は、脱水が認知機能に及ぼす影響を詳らかにしている。

Physiological research in extreme environments has clarified the effects of dehydration on cognitive function.

詳らかにする (tsumabiraka ni suru) means 'to clarify' or 'to reveal in detail'.

Colocações comuns

脱水症状

脱水機

脱水反応

脱水状態

脱水をかける

軽度の脱水

脱水機能

脱水が進む

脱水予防

強制脱水

Frases Comuns

脱水になる

— To become dehydrated. Used for people and animals.

熱中症で脱水になった。

脱水する

— To spin-dry or to dehydrate. Used for machines or processes.

洗濯物を5分脱水する。

脱水気味

— Slightly dehydrated; having a tendency toward dehydration.

今日は少し脱水気味だ。

脱水症状が出る

— Dehydration symptoms appear.

めまいなどの脱水症状が出た。

脱水が甘い

— Spin-drying is insufficient (literally 'sweet/soft').

脱水が甘くて服がまだ重い。

脱水完了

— Spin-dry cycle complete.

脱水完了の合図が鳴った。

脱水対策

— Measures against dehydration.

夏の脱水対策を教える。

脱水注意

— Warning: Dehydration risk.

掲示板に「脱水注意」とある。

脱水に陥る

— To fall into a state of dehydration.

遭難者は脱水に陥っていた。

脱水縮合

— Dehydration condensation (Chemistry).

脱水縮合によってエステルができる。

Frequentemente confundido com

脱水 vs 乾燥 (Kansō)

Kansō is drying via air/heat; Dassui is removing liquid water via spinning.

脱水 vs 下水 (Gesui)

Gesui means sewage; sounds similar due to 'sui' but completely different meaning.

脱水 vs 抜水 (Bassui)

Bassui is draining water from a pool/tank; Dassui is dehydration/spinning.

Expressões idiomáticas

"脱水した雑巾のような"

— Exhausted and shriveled like a wrung-out rag.

仕事が終わった彼は脱水した雑巾のようだった。

Informal/Metaphorical

"カラカラに脱水する"

— To dehydrate until bone-dry (often used for food or intense heat).

太陽の下で野菜がカラカラに脱水された。

Neutral

"脱水症状一歩手前"

— On the verge of dehydration.

彼は脱水症状一歩手前で救助された。

Neutral

"魂の脱水"

— Spiritual exhaustion (poetic usage).

都会の生活で魂が脱水してしまった。

Literary

"脱水機にかけられたよう"

— Feeling dizzy or spun around (like being in a spin cycle).

あまりの忙しさに、脱水機にかけられたような気分だ。

Informal

"知らぬ間の脱水"

— Dehydration that happens without one noticing.

冬でも「知らぬ間の脱水」に注意が必要だ。

Journalistic

"細胞レベルの脱水"

— Dehydration at the cellular level (dramatic emphasis).

この暑さは細胞レベルの脱水を引き起こす。

Scientific/Dramatic

"脱水の恐怖"

— The fear of dehydration (common in adventure stories).

砂漠での脱水の恐怖は計り知れない。

Neutral

"脱水との戦い"

— A struggle against dehydration (sports context).

真夏の試合は脱水との戦いでもある。

Journalistic

"完全脱水"

— Complete removal of water (technical or extreme).

標本を完全脱水して保存する。

Technical

Fácil de confundir

脱水 vs 渇水 (Kassui)

Sounds similar and relates to lack of water.

Kassui is a water shortage/drought in a city or dam. Dassui is dehydration in a person or laundry.

ダムが渇水している。

脱水 vs 排水 (Haisui)

Both involve water leaving.

Haisui is the drainage of waste water into pipes. Dassui is the extraction of water from an object.

排水口が詰まった。

脱水 vs 除湿 (Joshitsu)

Both remove moisture.

Joshitsu removes humidity from the air. Dassui removes liquid water from clothes or bodies.

除湿機をつける。

脱水 vs 吸水 (Kyūsui)

Opposite action.

Kyūsui is absorbing water. Dassui is removing it.

このタオルは吸水性がいい。

脱水 vs 止水 (Shisui)

Related to water flow.

Shisui is stopping the flow of water (like a valve).

止水栓を閉める。

Padrões de frases

[Noun] が脱水する

洗濯機が脱水する。

[Person] は脱水症状がある

彼は脱水症状がある。

[Noun] を脱水にかける

セーターを脱水にかける。

脱水を防ぐために [Action]

脱水を防ぐために水を飲む。

脱水に陥る危険がある

脱水に陥る危険がある。

脱水に伴う [Condition]

脱水に伴う頭痛。

脱水反応を経て [Result]

脱水反応を経て結合する。

[Cause] が脱水を惹起する

高温が脱水を惹起する。

Família de palavras

Substantivos

脱水機 (Spin-dryer)

脱水症状 (Dehydration symptoms)

脱水反応 (Dehydration reaction)

脱水縮合 (Dehydration condensation)

Verbos

脱水する (To dehydrate/spin-dry)

脱水される (To be dehydrated)

Adjetivos

脱水的な (Dehydrative - rare)

脱水状態の (Dehydrated state)

Relacionado

乾燥 (Drying)

排水 (Drainage)

吸水 (Water absorption)

補水 (Rehydration)

浸水 (Flooding)

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Como usar

frequency

High (Daily in summer and laundry).

Erros comuns

Using 'dassui' for environmental dry air. → 乾燥 (kansō)
Dassui is water removal from an object/body. Kansō is the state of the air or a general dry state.
Saying 'dassui o suru' for feeling thirsty. → 喉が渇く (nodo ga kawaku)
Dassui is a noun for a condition, not a verb you perform on yourself when thirsty.
Confusing 'dassui' with 'haisui' (drainage). → 脱水 (dassui)
Haisui is for pipes and waste water. Dassui is for clothes and bodies.
Pronouncing it as 'da-su-i'. → da-ssu-i
The small 'tsu' creates a double 's' sound. Forgetting it makes the word sound wrong.
Thinking 'dassui' means the clothes are ready to wear. → 乾燥 (kansō) or 乾いた (kawaita)
Dassui only removes excess water; the clothes are still damp and need drying.

Dicas

Use with 'Naru'

Remember to use the particle 'ni' when saying you became dehydrated: 'Dassui ni naru.' This is a very common pattern in medical contexts.

Summer Warnings

When you hear 'dassui' on the news, it's a signal to drink water immediately. Japanese news takes this very seriously to prevent heatstroke deaths.

Kanji Logic

Associate '脱' (datsu) with 'exit' and '水' (sui) with 'water'. Water-Exit. It makes remembering the meaning effortless.

Laundry Efficiency

If your clothes are taking too long to dry, try running the 'dassui' cycle one more time. Many Japanese people do this during the rainy season.

Electrolytes

In Japan, 'dassui' is often paired with 'enbun' (salt). Just drinking water isn't enough; you need salt too!

Small Tsu

Pay attention to the sharp stop in 'da-ssui'. If you say it too smoothly, it might be misunderstood as 'dasui' or 'dasai' (uncool).

Symptoms

When describing how you feel, 'dassui-shoujou' is more natural than just 'dassui'. It sounds more descriptive and accurate.

Compound Power

Learn 'dassuiki' and 'dassui-shoujou' together. Learning compounds is faster than learning individual words.

Laundry vs Health

Always check the environment. If you're in a bathroom, it's laundry. If you're outside in 35-degree heat, it's health.

Stroke Order

The right side of '脱' has a specific order. Practice it to make your handwriting look like a native's.

Memorize

Mnemônico

Think of a 'DAsh' to find 'SUI' (water) because you are 'DASSUI' (dehydrated).

Associação visual

Imagine a washing machine spinning so fast that water 'escapes' (脱) through the holes.

Word Web

水 (Water) 脱 (Shed/Remove) 熱中症 (Heatstroke) 洗濯機 (Washing machine) 喉 (Throat) 乾燥 (Dry) 病院 (Hospital) 夏 (Summer)

Desafio

Go to your washing machine or look at a picture of a Japanese one. Find the '脱水' button. Say the word out loud 5 times while imagining the water spinning out.

Origem da palavra

Originates from Middle Chinese 'thwat' (shed/escape) and 'swij' (water). It entered Japanese as a Sino-Japanese compound (Kango).

Significado original: To shed water or to remove moisture from a body or object.

Sino-Japanese (Kango)

Contexto cultural

When discussing 'dassui' with elderly people in Japan, it is a sensitive health topic as they are more prone to it and may not realize they are dehydrated.

In English, we distinguish between 'dehydration' and 'spinning clothes.' In Japanese, using the same word 'dassui' highlights the mechanical nature of water loss in both contexts.

OS-1 commercials (Oral Rehydration Solution) often feature the word 'dassui'. Weather forecasts during 'Natsu-bate' (summer fatigue) season. Laundry detergent ads emphasizing 'dassui' efficiency.

Pratique na vida real

Contextos reais

At the Hospital

脱水症状がありますか？
点滴で脱水を治します。
尿の色で脱水を確認します。
重度の脱水です。

Doing Laundry

脱水は何分にしますか？
脱水だけお願いします。
脱水の音がうるさいです。
脱水機が止まりました。

Summer Weather

脱水に気をつけてください。
こまめな給水で脱水を防ぎます。
脱水注意報が出ています。
子供の脱水は怖いです。

Sports Training

脱水にならないように休憩をとる。
体重が減ったのは脱水のせいだ。
脱水対策のドリンクを配る。
激しい脱水で足がつった。

Science Lab

脱水反応を観察する。
脱水剤を添加する。
完全脱水が必要だ。
脱水縮合のメカニズム。

Iniciadores de conversa

"「最近、暑いですね。脱水にならないように気をつけていますか？」"

"「この洗濯機、脱水の時の音がすごく大きくないですか？」"

"「スポーツドリンクと水、どっちが脱水にいいと思いますか？」"

"「昨日の夜はお酒を飲みすぎて、今朝はひどい脱水状態でした。」"

"「このデリケートな服、脱水機にかけても大丈夫かな？」"

Temas para diário

今日、脱水を防ぐために何リットルの水を飲みましたか？

洗濯機の脱水ボタンを押し忘れて困った経験はありますか？

日本の夏を過ごす時、脱水対策として何を準備しますか？

脱水症状（めまいや喉の渇き）を感じた時のことを書いてください。

『脱水』という言葉から連想する色や音は何ですか？

Perguntas frequentes

10 perguntas

Not really. 'Dassui' is a medical condition. If you are just thirsty, say 'Nodo ga kawaita.' Use 'dassui' if you feel sick from lack of water.

It is the spin-dry cycle. It spins the clothes at high speed to remove water so they aren't dripping wet when you hang them.

It is a noun, but it can be used as a verb by adding 'suru' (dassui suru).

It means 'dehydration symptoms,' such as dizziness, dark urine, or extreme thirst.

You say 'keido no dassui' (軽度の脱水).

It is 'dassui' with a double 's' (っす). The small 'tsu' is important for correct pronunciation.

No. They are still damp, just not dripping. You still need to hang them up or put them in a dryer (kanso-ki).

Usually, we use 'mizu-busoku' (lack of water) or 'kareta' (withered) for plants, but 'dassui' can be used in scientific contexts.

It is a machine used specifically for spinning water out, like a standalone spin-dryer or a salad spinner.

Because the high heat and humidity lead to heavy sweating, making people lose fluids and electrolytes very quickly.

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