1To lose the memory of something previously known or experienced; also to leave an object behind unintentionally. Used for forgetting appointments, tasks, or things.
かばんを電車に忘れてしまった。
I left my bag on the train.
彼の誕生日を忘れてしまい、後で謝った。
I forgot his birthday and apologized later.
パスワードを忘れて、ログインできなかった。
I forgot my password and couldn't log in.
つらい経験は簡単には忘れられない。
Painful experiences aren't easy to forget.