English Dictionary
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to do something without preparing it first, often because the situation does not allow you to prepare
She'd forgotten her carefully written speech, but knew she could easily improvise.
if a performer in a play or a group of musicians improvises, they invent words or musical notes without preparing them or learning them before
The last two scenes were completely improvised.
to make something from whatever is available, although it is not what you normally use
We used old shirts to improvise dressings for their wounds.