to peek (through a keyhole, gap, etc.)...

to peep (through), to peek, to examine (esp. covertly)...

peep, peeping, peep show...

peek, peeping, peeking

peek, peeping, peeking

to look into, to peer in

peeping Tom

peephole (e.g. in a door), observation window, viewing window

one-way mirror

to peek, to peep

peephole, spyhole, inspection hole...

faint indigo blue (traditional Japanese color name)

peep show, device with lens mounted on a stand or in a box to view enlarged pictures, water glass...

peep show, device with lens mounted on a stand or in a box to view enlarged pictures

to look into, to peer in

to peek, to peep

peep show, device with lens mounted on a stand or in a box to view enlarged pictures, water glass...

peep show, device with lens mounted on a stand or in a box to view enlarged pictures

voyeurism

to look (into), to peek, to peep...

peep show, device with lens mounted on a stand or in a box to view enlarged pictures

to look (into), to peek, to peep...

to examine someone's expression

to wait for an opportunity

to wait for one's chance, to wait for an opportunity

zoetrope (animation device)

to have a narrow view of things

to have a narrow view of things, to peek at the ceiling through the pith of a reed

to have a narrow view of things, to peep at the sky through a keyhole

to have a narrow view of things, to peek at the sky through the eye of a needle