noun
a form of improvisation where someone speaks or performs without preparation
verb
to improvise or speak or perform without preparation
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The actor impressed the audience with his ad-libbing skills during the live performance.
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She was so good at ad-libbing that she had everyone laughing at the party.
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I love when comedians start ad-libbing on stage, it's always so funny.
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In a crisis situation, sometimes you have to ad-lib your way through and make quick decisions.