The term 'matches up' can be defined as two or more things that are in agreement or harmony with each other. This term can be broken down into four crossword solutions: SYNCS (5 letters), JIBES (5 letters), PAIRS (5 letters), and AGREES (6 letters). SYNCS is an abbreviation of the word synchronize, which means to cause two or more things to occur at the same time. JIBES is a verb meaning to make jokes or teasing remarks. PAIRS is a noun referring to two people or things that are matched together. Finally, AGREES is a verb meaning to accept or concur with a proposal or opinion.