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Definition of “fly on the wall” - English Dictionary

"fly on the wall" in British English

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fly on the wall

If you say that you would like to be a fly on the wall on an occasion, you mean that you would like to hear what will be said or see what will happen while not being noticed: I'd love to be a fly on the wall when those two get home!

fly-on-the-walladjective [before noun]

uk   /ˌflaɪ.ɒn.ðəˈwɔːl/ us   /ˌflaɪ.ɑːn.ðəˈwɑːl/ UK
(Definition of fly on the wall from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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