fly on the wall

The phrase "fly on the wall" is an idiomatic expression used to describe observing or witnessing a situation, event, or conversation discreetly, without actively participating or being noticed. It implies being in a position where one can observe and gather information unnoticed, similar to a small insect like a fly on a wall.


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Just Saying will “sweep you off your feet” with challenges to complete English language idioms, sayings, and other colloquial phrases.

Includes English phrases for both younger and older players. The full version features over 3,000 English idioms.