Slipped out is a commonly used phrase that refers to something that was said accidentally or without conscious intention. There are several synonyms for this phrase that can be used in different contexts. Some of these synonyms include leaked, blurted out, spilled the beans, gave away, revealed, disclosed, let slip, uttered, mentioned inadvertently, and revealed unintentionally. While all of these synonyms have slightly different nuances, they all convey the idea that something has been said without proper forethought or planning. In situations where it is important to be tactful or maintain confidentiality, it is especially important to choose the right synonym for "slipped out".