peek ‧ a ‧ boo /ˌpiːkəˈbuː $ ˈpiːkəbuː/ BrE AmE 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!