Real Dictionary

peep
verb: If you peep, or peep at something, you have a quick look at it, often secretly and quietly.

peep in American English 1
a short, high-pitched sound; chirp; cheep
to make the short, high-pitched cry of a young bird or chick; chirp; cheep
intransitive verb: to look through a small opening or from a concealed location
noun: a quick or furtive look or glance
transitive verb: to show or protrude slightly

peep in American English 2
to look through a small opening or from a place of hiding
intransitive verb: to utter the short, shrill little cry of a young bird, a mouse, etc.; cheep; squeak
noun: a short, shrill little cry or sound, as of a young bird; cheep; squeak

peep in American English 3
noun: a jeep

peep in British English 1
to look furtively or secretly, as through a small aperture or from a hidden place
noun: a quick or furtive look

peep in British English 2
(esp of young birds) to utter shrill small noises
noun: a peeping sound