떨어질 때

when (someone or something) falls

→ 떨어지다
phrase Rare #22,420
when (someone or something) falls The subject and whether the fall is past or present are understood from context.
KO: 컵이 바닥에 떨어질 때 소리가 났어요.
EN: The cup made a sound when it fell to the floor.

아까 떨어질 때 였나 봐

I guess that must have been when it fell earlier.

— 마녀배달부 키키 (1989)