Definition of "Peep" :

noun: a secret look

noun: the short weak cry of a young bird

verb: appear as though from hiding

"The new moon peeped through the tree tops."

verb: speak in a hesitant and high-pitched tone of voice

verb: make high-pitched sounds

verb: cause to appear

"He peeped his head through the window."

verb: look furtively

"He peeped at the woman through the window."