凍らせる

The Japanese verb 凍らせる (kooraseru) is a transitive verb that translates to 'to freeze something' or 'to cause something to turn into ice.' In linguistic terms, it is the causative form of the intransitive verb 凍る (kooru), which means 'to freeze' (on its own). This distinction is vital in Japanese grammar: while a lake might freeze naturally (kooru), you are the one who freezes the water in an ice tray (kooraseru). This word is ubiquitous in daily life, especially in the kitchen, but it also carries significant weight in scientific, industrial, and even metaphorical contexts.

Culinary Usage

The most common scenario involves food preservation. Whether you are freezing leftovers, making homemade popsicles, or preparing meat for long-term storage, kooraseru is the action verb you need. It implies a deliberate act of lowering the temperature until the state of matter changes.

Metaphorical Use

Beyond physical ice, kooraseru is used to describe freezing someone's blood with fear or 'freezing' a social atmosphere. If someone makes a terrible joke that makes everyone go silent, they have 'frozen the place' (ba wo kooraseru).

In scientific contexts, this verb describes the process of solidification through cooling. It is less formal than the kanji-heavy compound 冷凍する (reitō suru), which is often used on product packaging or in commercial logistics. Kooraseru feels more like a direct, physical action. For instance, a child might say 'I want to freeze this juice' using kooraseru, whereas a factory manager would talk about 'reitō' processes. Understanding this nuance helps you sound more natural in different social strata. Furthermore, the verb is used in literature to describe the chilling effect of a cold wind or a terrifying gaze. When a monster in a story 'freezes' its prey with a look, kooraseru is the verb that conveys that terrifying transition from life to a motionless state.

Industrial Context

In construction or engineering, freezing the ground (jiban wo kooraseru) is a technique used to prevent water from leaking into tunnels. This shows the verb's versatility across different professional fields.

Finally, the concept of 'freezing' assets or accounts in a legal sense also uses this verb or its noun form. While 'shisann wo tōketsu suru' is the formal term, in casual explanation, one might say 'okane wo kooraseru' to mean making funds inaccessible. This breadth of meaning—from a simple ice cube to complex legal actions—makes kooraseru a vital addition to your B1 vocabulary. It bridges the gap between basic physical actions and more abstract conceptual descriptions of stillness and preservation.

Using 凍らせる correctly requires attention to its status as a transitive Ichidan verb. The basic structure is [Person] ga [Object] wo kooraseru. Because it is the causative form of 'kooru', it literally means 'to make something freeze.' This 'making' aspect is key. If you leave a bottle outside and it freezes due to the weather, you use 'kooru.' If you put it in the freezer, you use 'kooraseru.' This distinction is a hallmark of Japanese clarity regarding agency.

Instructional Use

When giving instructions, especially in recipes, you will often see the ~te form. 'Koorasete kara, meshiagare' (Eat after freezing it). This suggests a necessary step in a process.

In more complex sentences, you might use the potential form 'kooraserareru' (can freeze) or the passive form 'kooraserareru' (is frozen by someone). Note that the causative-passive 'koorasera-reru' is rare because the verb itself is already causative in origin. Instead, speakers usually stick to the simple causative or the intransitive 'kooru' depending on where they want to place the focus. If the focus is on the result, 'kootte iru' (is frozen) is preferred. If the focus is on the action of the person, 'koorasete aru' (has been frozen by someone for a purpose) is used.

Negative Forms

Using 'koorasenai' (not freeze) is common when warning someone about certain foods. 'Banana wa koorasenai de kudasai' (Please don't freeze the bananas). This is a vital structure for daily chores and kitchen management.

Furthermore, the verb can be combined with auxiliary verbs to add nuance. 'Koorasete oku' implies freezing something in advance for future use. 'Koorasete shimau' might imply that you accidentally froze something that shouldn't have been frozen, like a lettuce leaf in a fridge that was set too cold. This versatility allows Japanese speakers to describe not just the act of freezing, but the intention and the outcome behind it. In literary Japanese, writers might use 'kooraseru' to describe the winter wind freezing the earth, personifying the wind as the agent of the freezing action. This poetic usage adds a layer of depth to what is otherwise a very practical word.

Polite Forms

In polite speech, use 'koorasemasu'. For example, 'Kore wo koorasemashō ka?' (Shall I freeze this?). This is helpful when helping a host or working in a service job.

You will encounter 凍らせる in various real-world settings, ranging from the mundane to the dramatic. In Japanese households, it is a word heard daily. Parents might tell their children to freeze their juice to make 'sherbet' during the hot humid summers of Japan. In grocery stores, while 'reitō' is the formal word for frozen sections, staff might use 'kooraseru' when explaining how to prepare a certain fresh item for home storage. It is the language of the home and the hands-on worker.

Television and Media

Cooking shows are a prime place to hear this verb. Chefs often explain techniques for 'flash-freezing' vegetables to preserve their color and nutrients. They will say 'ikkini kooraseru' (freeze all at once/flash freeze).

In the world of entertainment, particularly in anime and manga, 'kooraseru' is a frequent term for characters with ice-based powers. A hero might yell out a move that 'freezes the enemy' (teki wo kooraseru). In horror movies or mystery dramas, a witness might describe a terrifying scene by saying it 'froze their spine' (seisuji wo kooraseru). This metaphorical use is deeply embedded in the Japanese psyche, linking the physical sensation of cold with intense emotional states like fear or shock.

Scientific Documentaries

When watching documentaries about the Arctic or space, narrators use 'kooraseru' to describe how extreme temperatures affect matter. It provides a more visceral feeling than the technical 'gyōko' (solidification).

In professional settings like laboratories or medical facilities, you might hear 'shiryo wo kooraseru' (freeze the sample). Even though 'reitō' or 'tōketsu' are available, 'kooraseru' is often used in verbal communication because it is shorter and more direct. It conveys the action clearly between colleagues. In literature, especially in the works of authors like Akutagawa or modern novelists, 'kooraseru' is used to describe the atmosphere of a room where a dark secret has been revealed. The verb captures the sudden, sharp transition from the fluid movement of life to the static, brittle nature of ice. This makes it a powerful tool for writers to evoke sensory and emotional responses in their readers.

The most frequent mistake learners make with 凍らせる is confusing it with its intransitive counterpart, 凍る (kooru). This is a classic 'transitivity pair' error. Remember: 'kooru' happens on its own (The lake froze), while 'kooraseru' requires an actor (I froze the juice). If you say 'Mizu ga kooraseta,' you are saying 'The water froze (something),' which makes little sense unless the water is a character in a fantasy novel. The correct way to say 'The water froze' is 'Mizu ga kōtta.'

Confusion with 'Hiyasu'

Another common error is using 'kooraseru' when you actually mean 'hiyasu' (to chill). If you put a beer in the fridge to make it cold but not solid, you are 'hiyasu'-ing it. If you say 'kooraseru,' the listener will think you are turning the beer into a block of ice, which might ruin it. Always distinguish between 'chilling' and 'freezing solid.'

Learners also struggle with the difference between 'kooraseru' and 'reitō suru.' While both mean to freeze, 'reitō suru' is a Sino-Japanese compound (kango) and is more formal or technical. Using 'reitō suru' in a casual conversation with a friend about making ice cubes can sound a bit stiff or overly clinical. Conversely, using 'kooraseru' in a formal business report about industrial food processing might sound a bit too colloquial. Choosing the right register is key to sounding like a natural speaker.

Additionally, some learners try to use 'kooraseru' for 'freezing' a computer screen. In Japanese, when a computer freezes, the word used is 'katamaru' (to harden/stiffen) or the loanword 'furīzu suru.' Saying 'Pasokon wo kooraseta' would imply you literally put your laptop in the freezer! This is a common pitfall because the English word 'freeze' covers both physical ice and software crashes, but Japanese separates these concepts clearly. Finally, watch out for the causative-passive form. While grammatically possible, it's a mouthful and rarely used. If you find yourself trying to say 'I was made to freeze something,' there's probably a simpler way to phrase it using the active voice or a different verb altogether.

Particle Choice

Using 'ni' instead of 'wo' is a mistake. Since 'kooraseru' is transitive, it always takes 'wo' for the object being frozen. 'Mizu ni kooraseru' is incorrect; it must be 'Mizu wo kooraseru.'

To truly master 凍らせる, you must understand where it sits in the cluster of related Japanese verbs. The most direct alternative is 冷凍する (reitō suru). As mentioned, this is more formal and often used for commercial products or the specific function of a freezer (reitōko). If you are talking about the technology of freezing, 'reitō' is your best bet. If you are talking about the physical act of turning water to ice at home, 'kooraseru' is more natural.

Comparison: Kooraseru vs. Hiyasu

Verb	Meaning	Result
凍らせる	To freeze	Becomes solid ice
冷やす	To chill	Becomes cold liquid

Another similar verb is 凍結させる (tōketsu saseru). This is the causative form of 'tōketsu' (freezing/solidification). It is used in highly technical, legal, or medical contexts. For example, 'shisann wo tōketsu saseru' (to freeze assets) or 'saibō wo tōketsu saseru' (to freeze cells). This is several steps more formal than 'kooraseru' and is rarely used in daily conversation. There is also 凍り付かせる (kooritsukaseru), which means 'to freeze something onto something else' or, metaphorically, to make someone 'freeze up' in fear. The 'tsuku' (attach) part adds an element of sticking or suddenness.

If you want to describe the process of making something cold without necessarily freezing it, 冷却する (reikyaku suru) is used in engineering and physics to mean 'to cool down' (like an engine). For a more poetic or literary sense of freezing, one might use 氷結させる (hyōketsu saseru), often seen in the names of alcoholic drinks (like Kirin Hyōketsu) to imply a crisp, icy refreshment. Finally, don't forget the intransitive 固まる (katamaru), which means 'to harden.' While not exactly freezing, the result (becoming solid) is similar, and it's the word used for computer 'freezes.' Understanding these nuances allows you to choose the exact 'flavor' of freezing or cooling you want to convey, making your Japanese much more expressive and precise.

Summary of Alternatives

• 冷やす (Hiyasu): To chill (liquid remains liquid).
• 冷凍する (Reitō suru): To freeze (commercial/food storage).
• 凍結する (Tōketsu suru): To freeze (assets/scientific samples).
• 固まる (Katamaru): To harden (or for computers).