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a fly on the wall

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a fly on the wall

(spoken)

someone who can secretly see and hear what happens I would love to be a fly on the wall at that meeting.

See also: fly, on, wall

a fly on the wall

if you say you would like to be a fly on the wall in a certain situation, you mean that you would like to be there secretly to see and hear what happens I'd give anything to be a fly on the wall when she tells him.

See also: fly, on, wall