Don't harm or be ungrateful to someone who helps or supports you.
This phrase dates to the 1700s and draws from the observation of animal behavior - pets or wild animals that bite their caregivers. The metaphor became a standard warning against ingratitude and self-destructive behavior toward benefactors, emphasizing practical wisdom about maintaining supportive relationships.
The phrase reveals an interesting assumption about power dynamics - it implies that being "fed" (supported) creates an obligation of gratitude and good behavior. Critics argue this can justify exploitation, while supporters see it as basic reciprocity. Either way, it's one of the few idioms that uses animal behavior to teach human social skills!
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