꼬투리를 잡아요 · 꼬투리를 잡았어요 · 말꼬투리를 잡다
to nitpick; to seize on a small slip to criticize
Example
그는 내 말의 꼬투리를 잡아서 계속 따졌어요.
He seized on something I said and kept arguing.
Word parts
꼬투리 = a seed pod, and also a small pretext or excuse to pick at.
Good to know
말꼬투리를 잡다 = to pounce on a slip of the tongue.