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peephole

[ peep-hohl ]
/ ˈpipˌhoʊl /
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noun

a small hole or opening through which to peep or look, as in a door.

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Origin of peephole

First recorded in 1675–85; peep1 + hole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for peephole

peephole
/ (ˈpiːpˌhəʊl) /

noun

a small aperture, such as one in the door of a flat for observing callers before opening
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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