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English definition of “tune (sth) up”

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tune (sth) up

verb [T] uk phrasal verb with tune   /tjuːn/ us    /tuːn/

(INSTRUMENT)

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.

(ENGINE)

to tune an engine
(Definition of tune (sth) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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