to compose and perform or deliver without previous preparation; extemporize

to improvise an acceptance speech.

to compose, play, recite, or sing (verse, music, etc.) on the spur of the moment.

to make, provide, or arrange from whatever materials are readily available

We improvised a dinner from yesterday's leftovers.

to compose, utter, execute, or arrange anything extemporaneously

When the actor forgot his lines he had to improvise.

verb

design , devise , plan , premeditate

verb

ad-lib , brainstorm , coin , concoct , contrive , dash off , devise , do offhand , do off top of head , dream up , extemporize , fake , fake it , improv , improvisate , invent , jam * , knock off * , make do , slapdash * , spark , speak off the cuff , throw together , wing it * , make up , ad lib , jam , wing