fly on the wall
An unseen observer or listener, as in I wish I could be a fly on the wall when she tells him she's pregnant. [Mid-1900s]
Words nearby fly on the wall
fly in the face of,
fly in the ointment,
fly line,
fly net,
fly off the handle,
fly on the wall,
fly orchid,
fly press,
fly rail,
fly river,
fly rod
Example sentences from the Web for fly on the wall
Since 1984, Newsweek has made a cottage industry out of its fly-on-the-wall post-election coverage of presidential campaigns.
He could play the fly-on-the-wall in Louis the Goon's life as long as he wanted.