There are many synonyms for the phrase "make a pass at someone," which refers to making an attempt at romantic or sexual advances towards someone. Some of the synonyms for this phrase include "flirt with," "hit on," "come on to," "make a move on," "seduce," "court," and "woo." Depending on the context and tone of the situation, these synonyms can convey different levels of intensity or sincerity. It is important to always respect other people's boundaries and consent when it comes to romantic or sexual advances, regardless of the specific phrase or synonym used.