Definitions

1. noun

A person who peeps, especially a spy or an observer who secretly watches or examines something.

“The paparazzi was acting as a peeper, trying to get a shot of the celebrity without being noticed.”

2. verb

To look at or examine something, especially secretly or in a way that is considered intrusive or sneaky.

“The kids were peeking through the curtains, trying to peep at their friends who were having a party.”