To compose, create, or perform something without advance preparation or planning (American spelling).
Formed from 'extempore' or 'extemporary' plus the American verb-forming suffix '-ize.' Same root as British 'extemporise,' just spelled for American English.
Stand-up comedians extemporize constantly—they'll respond to hecklers or adjust their material based on the crowd's energy, turning interruptions into comedy gold.
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