각서가 · 각서를
written pledge, memorandum, signed promise
Example
다시는 술을 마시지 않겠다고 아내에게 각서를 썼어요.
I wrote my wife a signed promise that I'd never drink again.
Word parts
각 remember+서 document
Literally 'a memo to remember' — a written promise you can be held to.
Good to know
Pronounced [각써] — the ㅅ becomes tense after ㄱ.
Related words