Peep/piːp/ Definition 1 of 4Pro Tip 1/3Sneaky Peek Use 'peep' when describing a look that's both quick and somewhat hidden or secretive. She peeped at the answers sheet when the teacher wasn't looking. Pro Tip 2/3Tiny Glimpse 'Peep' implies a very brief moment of sight, usually through a small space. Thomas peeped through the keyhole to see the surprise party preparations. Pro Tip 3/3Curiosity Context Often conveys curiosity or nosiness, sometimes with a playful tone. Curiosity made the kitten peep into the empty box.