Fly on the wall

Posted by Bruce Kahl on June 30, 2004

In Reply to: Fly on the wall posted by Steve Waugh on June 30, 2004

: I heard this girl use "fly on the wall" on tv. Can you tell me what it means...

It has the same connotation as "eavesdrop".
A fly on a wall with all its eyes has a view of all that is going on below him.