postman’s knock

noun
🔊/ˌpəʊstmənz ˈnɒk/
🔊/ˌpəʊstmənz ˈnɑːk/
(British English)
(North American English post office)
[uncountable]
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  1. a children’s game in which imaginary letters are exchanged for kisses邮差敲门游戏(儿童用假托的信件换取亲吻)Topics Games and toysc2