Meaning of “fly on the wall” in the English Dictionary

british 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)