peephole

American  

[peep-hohl] / ˈpipˌhoʊl /

noun

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

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peephole British  

/ ˈpiːpˌhəʊl /

noun

1. a small aperture, such as one in the door of a flat for observing callers before opening

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Etymology

Origin of peephole

First recorded in 1675–85; peep ¹ + hole

Example Sentences

If you’re home alone or with family members and you hear a knock at the door, check the window, security camera or peephole so you can identify whether ICE agents are outside.

From Los Angeles Times • Jun. 8, 2025

He then heard a second, "very aggressive knock" but did not see anyone when he looked through the peephole.

From BBC • May 9, 2024

The door was not equipped with a peephole, so Rehn couldn’t see who was demanding she open up.

From Seattle Times • Nov. 13, 2023

A series of knocks rattled his apartment door one day last fall, and Maksim peered through the peephole to see two soldiers in uniform.

From New York Times • Jan. 29, 2023

And indeed, the face that showed up at the peephole did look angry.

From "The Ear, the Eye, and the Arm" by Nancy Farmer