peekabooPronunciation: /piːkəˈbuː/ (also peek-a-boo)Translate peekaboo | into Italian Definition of peekaboo noun [mass noun] a game played with a young child, which involves hiding and suddenly reappearing, saying ‘peekaboo’. adjective [attributive] (of a garment) made of transparent fabric or having a pattern of small holes:a black lace peekaboo dress (of a hairstyle) concealing one eye with a fringe or wave. Origin: late 16th century: from peek + boo1peekaboo in other Oxford dictionaries Definition of peekaboo in the US English dictionary