1.TETTCthe process of making small changes to an engine so that it works as well as possible 〔发动机的〕微调保养
2an occasion that someone uses as preparation for a more important occasion 热身赛,准备活动
He is treating the semi-finals as a tune-up.
他把半决赛当成一场热身赛。
Examples from the Corpus
tune-up• If you give the engine regular tune-ups, it will last much longer.• Therefore, he is treating the semi-finaltrials more as a tune-up.• It's about time to take the car in for a tune-up again.• Perhaps the ownerasked for a spiritualtune-up.