|Origin:||Perhaps from Dutch kieken 'to look'|
to look quickly at something, or to look at something from behind something else, especially something that you are not supposed to see [↪ peep]
peek at/through/into etc
Carefully he peeked through the glass window in the door.
Paula opened the box and peeked inside.
Shut your eyes and don't peek!
2 [always + adverb/preposition]
if something peeks from somewhere, you can just see a small amount of it:
The moon peeked out from behind the clouds.
—peek noun [countable]
Diane took a quick peek at herself in the mirror.