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Meaning of 'Fly on the wall'

What does the saying 'Fly on the wall' mean?

Idiom: Fly on the wall

Meaning:

If you are able to see and hear events as they happen, you are a fly on the wall.
Country: International English | Subject Area: Animals | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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