fly on the wall

Definition

› 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! → See also fly-on-the-wallAudiences and spectators

(Definition of fly on the wall from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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