"Bite the hand that feeds you" is a phrase that means to harm or criticize someone who has helped or supported you. There are various synonyms for this phrase that can be used in different contexts. Some of the synonyms include "oppose the benefactor", "turn on one's ally", "show ingratitude", and "disrespect one's patron". Other alternatives that convey similar terms include "act ungrateful", "betray one's supporter", "attack one's mentor" and "insult one's well-wisher". These phrases are often used to emphasize the importance of being grateful to those who support us and the negative consequences of failing to appreciate their help and fostering negative relationships.