The phrase "give someone the pink slip" is an idiom that means to fire someone from their job. However, there are several other synonyms that can be used instead of this phrase. For example, one could say "terminate employment," "dismiss from their position," "let go," "sack," "discharge," or "lay off." Each of these phrases can be used interchangeably with "give someone the pink slip" depending on the context and the tone of the conversation. Whether one is firing someone or discussing employment matters, a wide range of synonyms is available to communicate the intended message.