adv. or adj. phr. 1. Out of proper musical pitch; too low or high in sound. The band sounded terrible, because the instruments were out of tune. 2. Not in agreement; in disagreement; not going well together. Often used with "with". What Jack said was out of tune with how he looked; he said he was happy, but he looked unhappy.
Compare: OFF-KEY.
Antonym: IN TUNE.