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]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for fly on the wall

bystander, snoop

Examples from the Web for fly on the wall

Contemporary Examples of 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.

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    Newsweek's Greatest Hits

    The Daily Beast

    May 5, 2010

Historical Examples of fly on the wall