Meaning of ～てしまう

The auxiliary verb ～てしまう(～te shimau) attaches to the te-form of a verb and has two main functions:

1. Completion / Finish doing something

It emphasizes that an action has been completed, often with a sense of finality.

・食べてしまいました。(Tabete shimai mashita.)
（I (completely) finished eating.）

・宿題をしてしまった。(Shukudai wo shite shimatta.)
（I finished my homework (all of it).）

Here, しまう is neutral or even positive, showing that something is done thoroughly.

2. Regret / Unintended action

It expresses that something happened by accident, against one’s will, or with regret.

・財布を忘れてしまった。(Saihu wo wasurete shimatta.)
(I (unfortunately) forgot my wallet.)


・彼に秘密を話してしまいました。(Kare ni himitsu wo hanashite shmai mashita.)
(I ended up telling him the secret (though I didn’t want to).)



So, the nuance depends on context:

  • If neutral: completion.

  • If negative: regret / mistake.




Spoken Contractions

In casual speech, ～てしまう often gets shortened:

  • ～てしまう(～te shimau) → ～ちゃう（～chau）

  • ～でしまう（～de shimau） → ～じゃう（～jyau）

Examples:

食べてしまう(tabete shimau) → 食べちゃう(tabe chau)

忘れてしまう(wasurete shimau) → 忘れちゃう(wasure chau)

死んでしまう(shinde shimau) → 死んじゃう(shin jyau)

These are very common in daily conversation.


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