English version

be a fly on the wall

From Longman Dictionary of Contemporary Englishbe a fly on the wallbe a fly on the wallto be able to watch what happens without other people knowing that you are there I wish I’d been a fly on the wall during that conversation. fly-on-the-wall fly
Examples from the Corpus
be a fly on the wallI wished I could be a fly on the wall.I wish I'd been a fly on the wall during that conversation.You should be a fly on the wall and hear him sing your praises.Oh, wouldn't I like to be a fly on the wall when you tell her the latest!
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