消します (消す)

The Japanese verb 消します (keshimasu), or its dictionary form 消す (kesu), is a fundamental transitive verb that primarily translates to 'to turn off,' 'to erase,' or 'to extinguish.' In the context of daily life in Japan, this word is ubiquitous because it covers a wide range of actions involving the removal or cessation of something's presence or activity. Whether you are turning off a light, erasing a mistake in your notebook, or deleting a digital file, kesu is the go-to term. It belongs to the 'Godan' or Group 1 verb category, which means its stem changes according to the following vowel. Understanding this word is essential for A2 learners because it facilitates basic communication regarding household chores, office work, and personal technology management. The word carries a nuance of intentionality; because it is a transitive verb, it implies that an agent (usually a person) is actively performing the action to change the state of an object from 'on' or 'visible' to 'off' or 'gone.'

Physical Objects

Used when removing physical marks, such as pencil writing with an eraser (keshigomu) or chalk from a blackboard. It implies the complete removal of the mark so that the surface returns to its original state.

Electronics and Power

Applied to lights, televisions, air conditioners, and computers. In modern Japanese, while 'kiru' (to cut) is also used for turning off power, 'kesu' is specifically used for lights and screens, emphasizing the disappearance of the light or image.

Beyond these common uses, kesu extends to more abstract or environmental contexts. For instance, it is used for extinguishing fires (hi o kesu), which is a critical safety phrase. It is also used for neutralizing smells (nioi o kesu) or muffling sounds (oto o kesu). In digital contexts, it is the standard word for 'delete' regarding photos, messages, or applications. The versatility of this verb stems from its core concept: taking something that is currently manifesting (as light, heat, sound, or data) and making it vanish. This makes it distinct from verbs like 'tomery' (to stop), which might imply a temporary pause rather than a complete removal or turning off. As you progress to higher levels, you will encounter kesu in more sophisticated forms, such as 'kehai o kesu' (to suppress one's presence or hide), often used in literature or stealth contexts. However, at the A2 level, focusing on its role in cleaning, power management, and error correction will provide a solid foundation for daily interactions.

Using 消します (keshimasu) correctly requires an understanding of Japanese sentence structure, specifically the use of the direct object particle を (o). Since kesu is a transitive verb, it always acts upon an object. The basic pattern is [Object] + を + 消します. For example, 'Terebi o keshimasu' (I turn off the TV). This structure remains consistent whether you are talking about physical objects, digital data, or environmental factors like fire or smell. It is important to distinguish this from its intransitive counterpart, 消える (kieru), which means 'to go out' or 'to disappear' on its own (e.g., 'The light went out' vs. 'I turned off the light').

Polite vs. Casual

In a formal or polite setting, use 'keshimasu'. In casual conversation with friends or family, use the dictionary form 'kesu'. For requests, the 'te-form' is used: 'keshite kudasai' (Please turn it off/erase it).

When dealing with past actions, the verb conjugates to keshimashita (polite past) or keshita (casual past). This is frequently used when confirming that a task has been completed, such as 'I already deleted the email' (Mou meeru o keshimashita). For negative sentences, use keshimasen (polite) or kesanai (casual). Note the 'a' sound in the casual negative form, which is a characteristic of Godan verbs ending in 'su'.

Common Objects

Common objects paired with this verb include: Denki (light), Terebi (TV), Kasai (fire), Kanji (characters/writing), De-ta (data), and Nioi (smell).

In more complex sentences, kesu can be combined with other verbs. For example, 'keshi-wasureru' means 'to forget to turn off/erase.' This is a common compound verb used in daily life, especially regarding stoves or lights. Another useful construction is the potential form, keseru (can erase/turn off), and the passive form, kesareru (to be erased/turned off). Understanding these variations allows you to describe not just the action itself, but the ability, the mistake, or the experience of the action being done by someone else. For an A2 learner, mastering the 'te-form' for requests and the polite past form for confirmation is the most practical priority.

You will encounter 消します (keshimasu) in a variety of real-world scenarios in Japan, ranging from household reminders to public safety announcements. One of the most common places is at home or in a dormitory. Parents often tell their children, 'Denki o keshinasai!' (Turn off the lights!), or roommates might ask, 'Saigo ni deru hito ga denki o keshite ne' (The last person to leave, please turn off the lights). This reflects the Japanese emphasis on energy conservation and mindfulness of shared spaces.

In the Classroom

Teachers frequently use this word when cleaning the blackboard. They might ask a student, 'Kokuban o keshite kuremasu ka?' (Could you erase the blackboard?). Students also use it when asking for an eraser: 'Keshigomu kashite' (Lend me your eraser—literally 'erasing rubber').

Public safety is another major domain for this word. In Japan, there are seasonal fire prevention campaigns. You might hear 'Hi o keshimashita ka?' (Did you turn off the fire/stove?) on neighborhood loudspeakers or see it on posters near residential areas. This refers specifically to the gas stove (konro), which is a common cause of domestic fires. The phrase 'Hi no moto o kakunin shite, hi o kesu' (Check the source of the fire and extinguish it) is a standard safety drill instruction.

Digital and Office Life

In the office, you'll hear it regarding data management. 'Kono fairu o keshite mo ii desu ka?' (Is it okay to delete this file?). It is also used when turning off office equipment like projectors or photocopiers at the end of the day. On smartphones, the 'delete' button is often labeled with the kanji '消' or the word 'Sakujo' (a more formal synonym), but in speech, people almost always say 'kesu'.

Finally, you will hear it in the service industry. A waiter might ask if they can take away (erase the presence of) an empty plate, or a clerk might ask if you want to 'erase' or cancel a point card transaction. In all these cases, the underlying theme is the transition from presence to absence, making kesu one of the most functional and frequently heard verbs in the Japanese language.

One of the most frequent mistakes English speakers make with 消します (keshimasu) is confusing it with its intransitive partner, 消えます (kiemasu). In English, the verb 'to turn off' or 'to go out' can sometimes feel similar, but in Japanese, the distinction between transitive (I do it to something) and intransitive (it happens on its own) is strict. If you say 'Denki ga keshimasu,' it sounds like the electricity is erasing something. The correct way to say 'The light is turning off' (on its own) is 'Denki ga kiemasu,' whereas 'I turn off the light' is 'Denki o keshimasu.'

Transitive vs. Intransitive

Mistake: 'Hi ga keshimashita' (The fire extinguished [something]). Correct: 'Hi ga kiemashita' (The fire went out) OR 'Hi o keshimashita' (I put out the fire).

Another common error involves using kesu for 'turning off' things that should use tomeru (to stop). While kesu is perfect for lights, electronics, and fires, it is generally not used for stopping a car engine, a water tap, or a clock. For a water tap, you should use 'mizu o tomeru' (stop the water). Using kesu here would sound very strange to a native speaker, as if you are trying to make the water itself vanish rather than stopping the flow.

Confusion with 'Kiru'

Learners often struggle between 'kesu' and 'kiru' (to cut). While 'denki o kiru' is acceptable for cutting the power, 'kesu' is more common for the act of turning off a light. However, for ending a phone call, you must use 'kiru' (denwa o kiru), not 'kesu'.

Finally, conjugation errors are common. Because kesu ends in 'su', its negative form is kesanai, not keshinai. Many beginners mistakenly apply the 'shi' from the polite form 'keshimasu' to the casual negative. Always remember the 's-line' conjugation: sa (negative), shi (polite), su (dictionary), se (imperative/potential), so (volitional). Misconjugating this can lead to confusion, especially in fast-paced casual conversation where the negative form is used frequently to say things like 'Don't erase that!' (Kesanai de!).

While 消します (keshimasu) is a very broad verb, there are several synonyms and related words that are more specific depending on the context. Understanding these will help you sound more natural and precise in your Japanese. The most direct formal synonym for 'erasing' or 'deleting' in a professional or technical context is 削除する (sakujo suru). You will see 'sakujo' on computer menus and in legal documents. While kesu is used in speech, sakujo is the standard written term for deleting data or removing a clause from a contract.

消す vs. 削除する (Sakujo suru)

'Kesu' is general and used for physical and digital things. 'Sakujo suru' is formal and almost exclusively used for digital data, text, or lists. You wouldn't 'sakujo' a fire or a light.

For turning off power, 切る (kiru) is a common alternative. While kesu focuses on the light or image disappearing, kiru focuses on cutting the electrical connection. You 'kiru' the power (dengen o kiru) or 'kiru' a phone call. In many cases involving electronics, they are interchangeable, but kesu feels slightly more common for household lights and kiru for switches and connections.

消す vs. 止める (Tomeru)

'Kesu' is for making things vanish (light, fire). 'Tomeru' is for stopping motion or flow (water, engines, music). If you 'kesu' music, you are turning off the device; if you 'tomeru' music, you are pausing the track.

Another interesting alternative is 抹消する (masshou suru), which is a very formal word meaning 'to obliterate' or 'to strike out.' This is used in high-level contexts like 'erasing a criminal record' or 'canceling a registration.' Finally, for extinguishing a fire in a professional firefighting context, the verb 消火する (shouka suru) is used. This is the noun-verb form of 'extinguish fire.' While you would tell a friend 'hi o keshite,' a news report would say 'shouka katsudou' (firefighting activities). By learning these distinctions, you can navigate different social registers and technical fields more effectively.