Extemporize

"Will you please tell me whose music you have been playing?" . . . "It's nobody's, miss." "Do you mean you have been extemporizing all this time?"

But while some of his predecessors liked to extemporize, Obama prefers the message to be just so.

As the music came fresher on their ears, they danced to its cadence, extemporizing new steps and attitudes.

The small jelly-speck, which we call the amoeba, has no organs save what it can extemporize as occasion arises.

The wine runs into pitchers, washing-basins, shards, chamber- vessels, and other extemporized receptacles.

His most famous words — "I have a dream" — were extemporized.