"Beware of the hand (that bites)" is the opposite of "Don't bite the hand that feeds you." It means to be wary of some people, especially those who can make a situation worse. Tony John coined this phrase.
Person 1: should we involve him? he might make matters worse.
Person 2: Beware of the hand (that bites).
Person 2: Beware of the hand (that bites).
by Tony John April 30, 2023