fly on the wall Definition in the Cambridge English Dictionary
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Definition of “fly on the wall” - English Dictionary

Definition of "fly on the wall" - British English Dictionary

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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   /-ɑːn.ðəˈwɑːl/ UK
A fly-on-the-wall ​televisionprogramme is one in which the ​peopleinvolvedbehavenormally, as if they are not being ​filmed: a fly-on-the-wall ​documentary
(Definition of fly on the wall from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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