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English definition of “tune (sth) up”

tune (sth) up

(INSTRUMENT) phrasal verb with tune     /tjuːn/ US  /tuːn/ verb [T]
If musicians who are preparing to play tune up their instruments , they make small changes to them so that they produce the correct notes : After the orchestra had tuned up, the conductor walked on to the stage . He began to tune up his violin .Technical music terms
(Definition of tune (sth) up (INSTRUMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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