improvise

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improvise

verb adept, ad-lib, compose, concoct, devise, extemporize, fabricate, invent, invent offhand, make up, originate, play by ear, ride with the waves, utilize, without preparation
See also: compose, conjure, contrive, create, devise, invent, make, originate, scheme
References in classic literature ?
I have not, sire," replied he; "but I will improvise one.
But hard upon that came the desperate attempt of a party of young clubmen from New York, who, inspired by patriotic and adventurous imaginations, slipped off in half a dozen motor-cars to Beacon Hill, and set to work with remarkable vigour to improvise a fort about the Doan swivel gun that had been placed there.
I could improvise something that would do the trick," the doctor said thoughtfully.