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Definition of Fly on the wall
1. Noun. (idiomatic) A quiet, non-participating, or unseen observer; an eavesdropper or witness. ¹
¹ Source: wiktionary.com
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1. Noun. (idiomatic) A quiet, non-participating, or unseen observer; an eavesdropper or witness. ¹
¹ Source: wiktionary.com