TUNE UP

v. 1a. To adjust (a musical instrument) to make the right sound. Before he began to play, Harry tuned up his banjo. 1b. To adjust a musical instrument or a group of musical instruments to the right sound. The orchestra came in and began to tune up for the concert. 2. To adjust many parts of (car engine) which must work together so that it will run properly. He took his car to the garage to have the engine tuned up.