Origin of fly-on-the-wall
"fly-on-the-wall." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/fly-on-the-wall>.
fly-on-the-wall. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/fly-on-the-wall
(plural flies on the wall)
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