peep sight

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WORDNET DICTIONARY

Noun peep sight has 1 sense

peep sight(n = noun.artifact) - rear gunsight having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned;

CIDE DICTIONARY

peep sight,

An adjustable piece, pierced with a small hole to peep through in aiming, attached to a rifle or other firearm near the breech; -- distinguished from an open sight. [Webster 1913 Suppl.]