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English definition of “trombone”

trombone

noun [C/U]    /trɑmˈboʊn/
a long, brass musical instrument with a U-shaped piece that is slid in and out of the main part of the instrument to vary the notes and played by blowing into it, or this type of instrument generally; a horn
(Definition of trombone noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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