Definition of peekaboo noun from the Oxford Advanced Learner's Dictionary

 

peekaboo

 noun
noun
BrE BrE//ˌpiːkəˈbuː//
 
; NAmE NAmE//ˌpiːkəˈbuː//
 
(British English also peep-bo)[uncountable] Children's games
 
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a simple game played to amuse young children, in which you keep hiding your face and then showing it again, saying ‘Peekaboo!’ or ‘Peep-bo!’ See related entries: Children's games Word Origin late 16th cent.: from peek + boo.
See the Oxford Advanced American Dictionary entry: peekaboo