Where does “てしまう” come from?

てしまう (Japanese) comes from Japanese て, from Japanese つ, from Old Japanese つ.

てしまう (Japanese): indicates that something undesirable was done or happened

Definitions

  1. indicates that something undesirable was done or happened

Ancestry of “てしまう”, step by step

てしまう traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1JapaneseA conjunctive particle, attaching to the...
2Japaneseindicates the completion of an action; indicates...
3Old Japanese

via Japanese しまう

StepLanguageWordMeaning
1Japaneseしまうto close; to finish, do something completely; to...
Every word from Old Japanese Every word from Japanese Every word from Japanese