tune up 1. (为乐器) 调音 (或定弦) The orchestra were already tuning up when we reached the concert hall. 我们到达音乐厅时乐队已经在调音了。 The instruments should be tuned up before each performance. 每次演出前得为乐器调音定弦。 2. 调整，调节 (机器等) tune up the motor of a car 调试汽车的发动机 (使能处于最佳工作状态) 3. 〈口〉开始演奏；开始唱；开始喊叫 (或哭等) The snorer begins to tune up. 打鼾者开始鼾声大作。 4. 〈俚〉(比赛前) 做准备动作