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English definition of “improvise”

improvise

verb [I/T]  /ˈɪm·prəˌvɑɪz/ us  
to invent or provide something at the time when it is needed without having already planned it: [T] We improvised a mattress from a pile of blankets. music To improvise music or speech is to invent it while you are performing it: [I] Hughes encourages young actors to improvise during rehearsals.
(Definition of improvise from the Cambridge Academic Content Dictionary © Cambridge University Press)
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