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English definition of “improvise”

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improvise

verb [I or T] uk   /ˈɪm.prə.vaɪz/ us  
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. We improvised a mattress from a pile of blankets. 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).
(Definition of improvise from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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