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improvise (verb) make or do with whatever is available; extemporize.
When you improvise you make or do something using whatever material is available, because you are forced to do it for want of equipment. If for want of a cap you make a cap out of the rags available, you improvise a cap. If caught in a rain in a wooded area, you make a temporary shelter for yourself by using the large leaves and branches you find there. You then improvise a shelter. When on the spur of the moment, that is, without a plan or a rehearsal, you compose a song or perform a dance, you improvise it. While acting in a play, if you forget a piece of dialogue written for you, you improvise, if you use your own dialogue.
- The slum dweller improvised a room out the abandoned cabin of a truck and a piece of tarpaulin he found on the road side.
- The dialogue he improvised in place of the one written he had forgotten proved to be more effective than the one written for him.