Definition of fair game noun from the Oxford Advanced Learner's Dictionary

 

fair game

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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if a person or thing is said to be fair game, it is considered acceptable to play jokes on them, criticize them, etc. The younger teachers were considered fair game by most of the kids.
See the Oxford Advanced American Dictionary entry: fair game