peephole

[ peep-hohl ]

/ ˈpipˌhoʊl /

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

Origin of peephole

First recorded in 1675–85; peep¹ + hole

peep, peep show, peep sight, peepee, peeper, peephole, peeping tom, peeps, peepshow, peepul, peer

The officers covered the peephole so that their faces would be obscured, and Taravati opened the door.

‘Happy’ Dancers Arrested, Abused in Iran |Shima Sharabi |May 21, 2014 |DAILY BEAST
What you get at the end is a peephole for a private moment that rapidly becomes very voyeuristic.

Remembering Mike Kelley |Justin Jones |October 12, 2013 |DAILY BEAST
Then she slipped into the closet of the bedroom and fumbled for the peephole opening.

The Cry at Midnight |Mildred A. Wirt
I did not feel strong enough to crawl noiselessly to the peephole, or I would have gone there.

The War of the Worlds |H. G. Wells

All the boys were thinking hard, from time to time approaching the peephole to watch the bears.

The Bungalow Boys Along the Yukon |Dexter J. Forrester
Tom found a peephole in the sod covering of the shack and peered through.

The Bungalow Boys Along the Yukon |Dexter J. Forrester
Levelling it he sent a volley crashing through the peephole.

Red Masquerade |Louis Joseph Vance

peephole

/ (ˈpiːpˌhəʊl) /

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