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Region: General | Usage example: She wanted to be a fly on the wall during the briefing.

Fly on the wall

Meaning

Observing events unnoticed.

Usage

Used to describe wanting to witness something quietly.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Insects on walls observe without being seen.

Used in journalism and espionage contexts since the 20th century.