peek‧a‧boo /ˌpiːkəˈbuː $ ˈpiːkəbuː/ interjection, noun [uncountable]
[Date: 1500-1600; Origin: peek + boo]
a game you play to amuse young children, in which you hide your face and then show it again, or the word you say when you play this game:
Peekaboo! I see you!

[TahlilGaran] Dictionary of Contemporary English ▲