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English definition of “improvise”

improvise

verb [I or T]     /ˈɪm.prə.vaɪz/
to invent or make something, such as a speech or a device, at the time when it is needed without already having planned it: I hadn't prepared a speech so I suddenly had to improvise. To sleep on, we improvised a mattress from a pile of blankets.Inventing, designing and innovationCreating and producing When actors or musicians improvise, they perform without prepared speech or music, making up the play, music, etc. as they perform it: During certain scenes of the play there isn't any script and the actors just improvise (the dialogue).Acting, rehearsing and performingPlaying musicSinging in general
(Definition of improvise verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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