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tune (sth) up

(INSTRUMENT) phrasal verb with tune
 
/tjuːn/
 
US  /tuːn/ verb [T]

Definition

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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