peep 2 
(p
ēp)
v. peeped, peep·ing, peeps
v.intr.1. To peek furtively; steal a quick glance.
2. To peer through a small aperture or from behind something.
3. To appear as though emerging from a hiding place: the moon peeping through the clouds.
v.tr. To cause to emerge or become partly visible: He peeped his head through the door.
n.1. A quick or furtive look or glance.
2. A first glimpse or appearance: the peep of dawn.
[Middle English pepen, perhaps alteration of piken, to peek; see PEEK.]