to look cautiously or slyly, esp through an aperture; to peek

(often + out) to begin to emerge from concealment; to show slightly

a brief or furtive look; a glance

the first faint appearance of something

at the peep of dawn

to make a feeble shrill sound as of a bird newly hatched; to cheep

to make a high-pitched electronic sound; to bleep

to utter the slightest sound

Every time he peeps, she jumps to see what's the matter — Benjamin Spock