expression
this isn't over; I'll get my revenge
A threatening phrase used when someone has been wronged and intends to retaliate. Often implies that the speaker will not let the matter go without payback. Common in dramatic or confrontational contexts.
覚えてろよ。ただでは済まさないからな。
Remember this. I won't let you get away with it.
彼は「ただではおかない」と言って部屋を出て行った。
He said, "You'll pay for this," and left the room.