1. (v. i.) To speak extempore; especially, to discourse without special preparation; to make an offhand address.

2. (v. t.) To do, make, or utter extempore or off-hand; to prepare in great haste, under urgent necessity, or with scanty or unsuitable materials; as, to extemporize a dinner, a costume, etc.

ad-lib be caught napping be surprised be taken unawares be unprepared cook up dash off do offhand fake go off half-cocked have no plan improvisate improvise jury-rig knock off lash up make up play by ear scrap the plan strike off throw off throw together toss off toss out vamp whip up whomp up wing it