General Definition: 1. Something small and round in the eye, on the eye, or close to the eye, such as a pupil or a monocle, or anything directly or indirectly associated with this, especially peeping through a hole. As a Noun: 1. A person who secretly looks at other people when they believe they are not being watched, especially when they are undressing. English = Peeping Tom. 2. The small, round, black hole in the centre of your eye. English = pupil. 3. A glass lens which people in former times wore in front of one of their eyes to improve their ability to see with that eye. English = monocle. As a Verb or Adjective: 1. To have a quick look at something, often secretly. English = peep . 2. To have a look at something through a small hole, such as a keyhole in a door.