Etymology From Middle English *peken, piken, pyken (“to peep”), probably a fusion of Middle English pepen (“to peep”) and keken, kiken (“to keek, look, spy”), equivalent to a blend of peep + keek. Perhaps also possibly a metathetic alteration of Middle English kepen, kipen, kypen (“to keep, look, observe, watch”).
1
Informal To look slyly, or with the eyes half closed, or through a crevice; to peep.
Close your eyes, and no peeking!
2
Informal To be only slightly, partially visible, as if peering out from a hiding place.
A pale strip of white skin peeked out from under his waistband.2012, Rachel Kramer Bussel, Going Down: Oral Sex Stories, →ISBN:
Her brown skin peeked through the empty gap in her clothing.2012, Michelle Monkou, If I Had You, →ISBN:
3
Video gamesInformal To briefly move out of cover (to gather visual information).
We are peeking the value from the first index's memory location.2006, Gary Willoughby, PureBasic: A Beginner's Guide to Computer Programming, page 279:
Etymology From Middle English *peken, piken, pyken (“to peep”), probably a fusion of Middle English pepen (“to peep”) and keken, kiken (“to keek, look, spy”), equivalent to a blend of peep + keek. Perhaps also possibly a metathetic alteration of Middle English kepen, kipen, kypen (“to keep, look, observe, watch”).