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improvise

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To improvise is defined as to do something on the spur of the moment.

(verb)

An example of to improvise is someone having to give a speech without any notice.

See improvise in Webster's New World College Dictionary

transitive verb, intransitive verb improvised, improvising

to compose, or simultaneously compose and perform, on the spur of the moment and without any preparation; extemporize
1. to bring about, make, or do on the spur of the moment: to improvise a solution to a problem
2. to make, provide, or do with the tools and materials at hand, usually to fill an unforeseen and immediate need: to improvise a bed out of leaves

Origin: Fr improviser < It improvvisare < improvviso, unprepared < L improvisus, unforeseen < in-, not + provisus, pp. of providere, to foresee, anticipate: see provide

Related Forms:

improviser noun or improvisor or improvisator

See improvise in American Heritage Dictionary 4

verb im·pro·vised, im·pro·vis·ing, im·pro·vis·es

verb, transitive

To invent, compose, or perform with little or no preparation.
To play or sing (music) extemporaneously, especially by inventing variations on a melody or creating new melodies in accordance with a set progression of chords.
To make or provide from available materials: improvised a dinner from what I found in the refrigerator.

verb, intransitive