Longman Dictionary of Contemporary English homepage

fly-on-the-wall

 adjective
     
Related topics: Television and Radio
fly-on-the-wall [only before noun]
AMT a fly-on-the-wall television programme shows people's daily lives in a very natural way, because they forget that they are being filmed

➔ be a fly on the wall

at fly3 (6)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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