"Become spoiled" is a phrase often used to describe food that has passed its expiration date or a person who has become entitled or overly pampered. Synonyms for "become spoiled" include "go bad," "spoil," "rot," "turn rancid," "decay," "putrefy," "fester," and "stink." These words can be used interchangeably depending on the context of the situation. For example, food can "go bad" if left out in the heat, while a child may "become spoiled" if given everything they want without consequences. Using synonyms for "become spoiled" can add variety and depth to one's language, making communication more effective and engaging.