凍らす

The Japanese verb 凍らす (kōrasu) is a transitive verb that specifically refers to the act of freezing something. In the realm of Japanese linguistics, distinguishing between transitive and intransitive verbs is crucial for clarity. While kōru (凍る) means that something freezes on its own or as a result of the environment (intransitive), kōrasu implies that an agent—usually a person or a specific mechanical process—is actively performing the action to turn a liquid or soft substance into a solid state through cold temperatures. This word is a staple in culinary contexts, scientific descriptions, and metaphorical storytelling. When you put a bottle of water in the freezer to make ice, you are performing the action of kōrasu. It is a Godan verb, which means its conjugation follows the five-step pattern common to many traditional Japanese verbs.

Grammatical Category

Transitive Verb (他動詞 - Tadōshi). It requires a direct object marked by the particle 'o' (を).

Core Meaning

To freeze something; to turn something into ice; to chill something until it solidifies.

Historically, the word has roots in the concept of 'fixing' or 'hardening' a substance. In the context of ancient Japan, where ice was a luxury item stored in himuro (ice houses), the act of freezing or preserving ice was a significant logistical feat. Today, the word is used daily in modern households. Whether you are 'freezing' grapes for a summer snack or 'freezing' a sample in a laboratory for preservation, kōrasu is the active verb of choice. It carries a sense of intentionality. When a chef says they are going to freeze a specific sauce to create a unique texture, they use kōrasu because it is a deliberate step in their craft.

Furthermore, kōrasu can be used metaphorically. In literature or dramatic dialogue, one might speak of 'freezing' someone's heart with a cold gaze or 'freezing' the atmosphere of a room with a chilling remark. This usage parallels the English 'to freeze' in its ability to describe emotional or social stagnation. However, in Japanese, the transitive nature of kōrasu emphasizes that the speaker or subject is the one causing this atmospheric change. It is an impactful word that conveys power over the state of matter and the state of emotion alike.

In technical settings, such as cryogenics or food science, kōrasu might be replaced by more formal Sino-Japanese compounds like tōketsu saseru (凍結させる), but in standard B1-level Japanese, kōrasu remains the most versatile and natural way to describe the action. It is also frequently found in recipes, particularly those involving 'no-bake' desserts or food preservation techniques where freezing is a key step. Understanding the nuance of this verb helps learners move beyond simple descriptions of the weather and into describing human actions and intentions involving temperature control.

Using 凍らす (kōrasu) correctly requires a firm grasp of the 'Object-Particle-Verb' structure. Since it is a transitive verb, you will almost always see the particle を (o) preceding it. The object being frozen is the focus of the action. For example, if you are freezing fish to keep it fresh, 'fish' (sakana) is the object: Sakana o kōrasu. The verb conjugates as a standard Godan verb ending in ~su, making it similar to hanasu (to speak) or dasu (to put out).

Positive Politeness

凍らします (kōrashimasu) - I freeze (something).

Negative Form

凍らさない (kōrasanai) - I do not freeze (something).

Te-Form (Connecting)

凍らして (kōrashite) - Freeze and... / Freezing...

One of the most common mistakes for English speakers is using the intransitive kōru when they mean they are the ones doing the freezing. If you say Mizu ga kōru, it means 'The water freezes' (perhaps because it is winter outside). But if you say Mizu o kōrasu, it means 'I am freezing the water' (perhaps to make ice for a drink). This distinction is vital for accurate communication in a Japanese kitchen or workplace. Another nuance involves the resultative state. If you want to say something 'is frozen' (as a result of someone's action), you might use the te-aru construction: Sakana ga kōrashite aru (The fish has been frozen).

In more complex sentences, kōrasu can be combined with auxiliary verbs like ~oku (to do in advance). Kōrashite oku means 'to freeze something ahead of time.' This is a very natural expression used by Japanese speakers when preparing for a party or managing household chores. You might also encounter the potential form kōraseru (can freeze), which happens to look identical to the causative form of kōru. This can be a point of confusion for learners, but context usually clarifies whether the meaning is 'can freeze something' or 'to make something freeze.'

Finally, consider the level of formality. While kōrasu is perfectly fine for daily conversation, in formal writing or professional manuals, you might see reitō suru (冷凍する - to refrigerate/freeze). However, kōrasu feels more 'physical' and 'direct.' It describes the change in the state of matter itself rather than just the storage method. Using kōrasu shows a command of native-like verb choices that go beyond the most basic textbook vocabulary. It allows you to describe actions with precision and intent.

You will hear 凍らす (kōrasu) in a variety of real-world settings, ranging from the mundane to the dramatic. In a typical Japanese home, the kitchen is the primary 'habitat' for this verb. Parents might tell their children, 'Zeri o kōrashite tabeyō' (Let's freeze the jelly and eat it). On television, especially during cooking shows or variety programs that feature 'life hacks' (ura-waza), experts will explain how to kōrasu vegetables like spinach or mushrooms to preserve their nutritional value or enhance their flavor when cooked later.

Daily Life

Freezing leftovers, making ice cubes, preparing frozen treats like 'mikan' (frozen mandarins).

Media & Entertainment

Horror movies (blood-curdling), fantasy anime (ice magic), and weather reports (artificial snowmaking).

In the world of anime and manga, characters with ice-based abilities often use the word kōrasu when declaring their attacks. A character might shout, 'Subete o kōrashite yaru!' (I'll freeze everything!). Here, the word takes on a powerful, almost aggressive tone. It’s not just about temperature; it’s about the absolute cessation of movement and life. Similarly, in mystery novels, a writer might describe a scene that 'freezes the blood' (chi o kōrasu) of the protagonist, indicating extreme terror. This metaphorical use is deeply embedded in the Japanese psyche, linking physical coldness with primal fear.

In commercial settings, you might hear this word at a fish market or a supermarket. A clerk might explain that the tuna was 'flash-frozen' to maintain its quality. While they might use the technical term kyūsoku reitō, in casual explanation, they could say, 'Sugu ni kōrashite arimasu' (It was frozen immediately). Additionally, in winter sports contexts, such as maintaining an ice rink, staff might discuss the process of 'freezing' the water to create a perfect skating surface. The word is versatile enough to cover both the high-tech industrial process and the simple act of making an ice cube at home.

Finally, listen for it in documentaries about nature or science. When discussing how certain animals survive sub-zero temperatures, or how scientists preserve ancient seeds, kōrasu is used to describe the intentional act of lowering the temperature until solidification occurs. It’s a word that bridges the gap between the natural world and human intervention, making it an essential part of a B1 learner's vocabulary for describing the world around them.

One of the primary hurdles for learners of Japanese is the distinction between transitive and intransitive pairs. For 凍らす (kōrasu), the most frequent error is confusing it with its intransitive counterpart, 凍る (kōru). If you say 'Mizu o kōru' (I freeze the water), it is grammatically incorrect because kōru cannot take a direct object. You must use kōrasu or kōrase-ru when you are the one doing the action. Conversely, saying 'Ike ga kōrasu' (The pond freezes [something]) makes no sense unless the pond is an active character in a fairy tale freezing something else.

Mistake #1: Transitivity

Using kōru (intransitive) with an object, or kōrasu (transitive) without one. Remember: [Object] を 凍らす vs. [Subject] が 凍る.

Mistake #2: Confusion with 'Kogoeru'

Confusing kōrasu with kogoeru (凍える). Kogoeru is used specifically for people or body parts feeling painfully cold or becoming numb. You cannot 'kōrasu' a person unless you are literally turning them into a block of ice.

Another common pitfall is the conjugation of kōrasu. Because it ends in ~su, some learners mistakenly treat it as a Ru-verb or Ichidan verb, especially because it sounds similar to the causative kōrase-ru. Remember that kōrasu is a Godan verb. Its negative is kōrasanai, not kōrasenai (which would be 'cannot freeze'). Getting these small vowel shifts right is the hallmark of a B1-B2 level student. Furthermore, learners often use kōrasu when they simply mean 'to chill' (like a beer). For chilling without freezing, hiyasu (冷やす) is the correct choice. If you kōrasu a beer, the bottle might explode!

There is also a subtle nuance between kōrasu and kōrase-ru. While both are used to mean 'to freeze something,' kōrase-ru is the causative form of kōru. In many cases, they are interchangeable, but kōrasu is often perceived as a more direct, intentional action. Using kōrase-ru can sometimes imply 'letting' something freeze. For example, 'Mizu o kōrase-ru' could mean you left the water outside in the cold to let it freeze, whereas 'Mizu o kōrasu' sounds more like you actively put it in a freezer.

Finally, avoid using kōrasu for abstract concepts like 'freezing a bank account' or 'freezing prices.' For these legal or economic contexts, Japanese uses tōketsu suru (凍結する). Using kōrasu in these situations would sound like you are literally pouring water on your bank card and putting it in the freezer. Always consider if the 'freezing' is physical (ice-related) or metaphorical/functional before choosing your verb.

Japanese has a rich vocabulary for temperature and states of matter. While 凍らす (kōrasu) is the primary verb for actively freezing something, several other words offer different nuances. Understanding these alternatives will help you sound more natural and precise. The most direct relative is kōrase-ru (凍らせる), the causative form. As mentioned, it is very common and often preferred in casual speech for 'to freeze something.' However, kōrasu remains a strong, active verb choice in literature and specific contexts.

冷やす (Hiyasu)

To chill or cool down. Use this for drinks, feverish foreheads, or cooling down hot food without turning it into ice.

冷凍する (Reitō suru)

To refrigerate/freeze for storage. This is a technical or formal term often seen on food packaging (e.g., reitō shokuhin - frozen food).

凍結する (Tōketsu suru)

To freeze (solid). Used in scientific, technical, or abstract contexts (like freezing assets or a project).

Another interesting comparison is with kogoeru (凍える), which means 'to be chilled to the bone' or 'to freeze' in the sense of a person being cold. It is intransitive and only applies to living things. If you say 'Karada o kōrasu' (to freeze the body), it sounds like you are a mad scientist or a villain. If you just mean 'I'm freezing!' you should say 'Kogoesō da!'. Then there is hiyasu (冷やす), which is the transitive partner of hieru (冷える). Hiyasu is much more common in daily life because we chill things far more often than we freeze them solid.

In literary contexts, you might encounter hyōketsu suru (氷結する), which means 'to freeze over' or 'to crystallize into ice.' This is often used for lakes or large bodies of water. While kōrasu is about the act, hyōketsu focuses on the state and the beauty of the ice formation. If you are describing a beautiful winter scene where a wizard freezes a waterfall, kōrasu works for the action, while hyōketsu works for the resulting spectacle. Understanding these layers of meaning allows you to choose the word that fits the 'temperature' of your conversation.

Finally, consider the word kooru (凍る). It is the intransitive foundation. Many learners find it helpful to learn these as a set: kōru (it freezes), kōrasu (I freeze it), kogoeru (I am freezing cold). By grouping these words together, you create a semantic web that makes it easier to recall the correct term during a conversation. Whether you are talking about the weather, food, or a scary movie, having these alternatives at your fingertips will greatly enhance your Japanese expression.