From Longman Dictionary of Contemporary Englishpeekaboopeek‧a‧boo /ˌpiːkəˈbuː $ ˈpiːkəbuː/ interjection, noun [uncountable] DGOa 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!Origin peekaboo (1500-1600) peek + boo
