you-know-what

pronoun
🔊/ˌjuː nəʊ ˈwɒt/
🔊/ˌjuː nəʊ ˈwʌt/
(informal)
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  1. used when you want to talk about something without mentioning its name, although the person you are speaking to knows what it is
    • Our neighbour was finally arrested for you-know-what.我们的邻居终于因您知道什么被捕。