punchline

noun
🔊/ˈpʌntʃlaɪn/
🔊/ˈpʌntʃlaɪn/
(also North American English, informal tag line)
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  1. the last few words of a joke that make it funny(笑话最后的)妙趣横生的语句,妙语;画龙点睛之语
    • He forgot the punchline and the joke fell flat.他忘记了重点,笑话变得平淡无奇。