tune up phrasal verbphr v a) APMwhen musicians tune up, they prepare their instruments to play at the right pitch 给〔乐器〕调音tune something ↔ up The band were tuning up their guitars. 乐队在给吉他调音。
b) tune something ↔ up to make small changes to an engine so that it works as well as possible 调试〔引擎〕
→ tune up at tune2(4)