bite the hand that feeds you可不是咬伤喂养你的手，而是恩将仇报；伤害恩人；忘恩负义。

【例句】
Regarding your boss, you shouldn't bite the hand that feeds you.
至于你的老板，你不应对他恩将仇报。

Remember, John, never bite the hand that feeds you.
要记得不可忘恩负义。