bite the hand that feed
恩將仇報;忘恩負義
口語·表示恩將仇報
英文釋義
to harm or betray someone who has helped or supported you
例句
He criticized his boss publicly, which is like biting the hand that feeds him.
典故來源
源自字面'咬喂養自己的手',比喻傷害或背叛幫助自己的人。