ㄐㄧㄡㄅㄧㄢˋ˙jiūbiànzi

揪辫子
  1. 比喻緊緊抓住別人缺點錯誤當作把柄 做事力求謹慎不怕揪辮子」。

to grab sb by the queue (i.e. hair)​, to seize on weak points, to exploit the opponent's shortcomings