아까 했던

that was done earlier

→ 아까
phrase Rare #17,070
that was done earlier 아까 means “earlier” or “a little while ago,” and 했던 describes something someone did then. It usually modifies a noun, as in 아까 했던 이야기 (“the story we talked about earlier”).
KO: 아까 했던 약속을 기억해요?
EN: Do you remember the promise we made earlier?