Fit up is a phrasal verb that means to equip or furnish something with the necessary items or components. There are many synonyms for fit up that can be used interchangeably in various situations. Some alternative phrases include outfitting, equipping, kitting out, fitting out, decking out, and providing. Depending on the context, other synonyms for fit up may include preparing, assembling, adding, supplying, fixing up, or arranging. Regardless of the phrase used, the general idea remains the same: to ensure that something is ready for its intended purpose by supplying it with everything it needs. Whether you are fitting up a room, outfitting a boat, or equipping a team, these synonyms can help you articulate your thoughts and intentions.