Definitions from Wiktionary (punch line)

▸ noun:  The final part of a joke; the word, sentence, or exchange of sentences that is intended to be funny and provokes laughter from the listeners.
▸ noun:  (by extension) The butt of a joke; laughing stock.
▸ noun:  (by extension) A final, concluding statement that an explanation has been leading up to; a conclusion.
▸ Also see punch_line

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