/ piːk; NAmE / verb [ v ]
1.
peek (at sth) to look at sth quickly and secretly because you should not be looking at it
SYN peep :
No peeking!
I couldn't resist peeking in the drawer.
She peeked at the audience from behind the curtain.
2.
peek out / over / through, etc. to be just visible :
Her feet peeked out from the end of the blanket.
► peek noun [ sing. ]:
I took a quick peek inside.
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WORD ORIGIN
late Middle English pike , pyke , of unknown origin.