punch-line

punch line

noun
the climactic phrase or sentence in a joke, speech, advertisement, or humorous story that produces the desired effect.

Origin:
1920–25, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
punch line
 
n
the culminating part of a joke, funny story, etc, that gives it its humorous or dramatic point

Collins English Dictionary - Complete & Unabridged 10th Edition
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