Definition of Simon says noun from the Oxford Advanced Learner's Dictionary

 

Simon says

 noun
noun
BrE BrE//ˌsaɪmən ˈsez//
 
; NAmE NAmE//ˌsaɪmən ˈsez//
 
[uncountable] Children's games
 
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a children’s game in which players should only do what a person says if he/she says ‘Simon says…’ at the beginning of the instruction See related entries: Children's games
See the Oxford Advanced American Dictionary entry: Simon says