Definition of Simon says noun from the Oxford Advanced American Dictionary

 

Simon says

 noun
noun
NAmE//ˌsaɪmən ˈsɛz//
 
[uncountable]
 
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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 the Oxford Advanced Learner's Dictionary entry: Simon says