트집이 · 트집을
faultfinding, nitpicking, picking a fight over nothing
Example
그는 괜히 음식 맛에 트집을 잡았어요.
He found fault with the taste of the food for no reason.
Word parts
Probably first meant a crack or gap in something; it now means a pretext for complaining.
Good to know
Used as 트집을 잡다; 꼬투리 is a small detail grabbed, 트집 is the act of complaining about it.