뒷다리

A rear limb of a four-legged animal.

A leg placed at the back when one splits his/her legs front and back.

A back leg of a piece of furniture such as a desk, chair, etc.

뒷다리(가/를) 잡히다

To become unable to escape since one's weakness has been seized upon.

To behave stupidly by bringing up again what has already been decided or concluded.

To control someone by seizing on his/her weakness.