peeping Tom noun

1. A man who furtively spies on other people, esp one who peeps in at windows
2. A voyeur

Peep-o'-day Boys plural noun

An Ulster Protestant society (1780–95) opposed to the Catholic Defenders

peep of day noun

The first appearance of light in the morning

peepˈshow noun

A small entertainment, film or series of pictures, esp of erotic or pornographic nature, viewed through a small hole, usu fitted with a magnifying glass

peep sight noun

A backsight with a small hole

peepˈ-through adjective

Capable of being seen through

peepˈ-toe noun

A shoe cut away so as to show the toe (also adjective)