To stare at (someone or something), especially impertinently, amorously, or covetously.
An eye.
An impertinent, flirtatious, amorous or covetous stare.
To look slyly, or with the eyes half closed, or through a crevice; to peep.
To be only slightly, partially visible, as if peering out from a hiding place.
A quick glance or look.