Definition of Monday morning quarterback noun from the Oxford Advanced Learner's Dictionary

 

Monday morning quarterback

 noun
noun
BrE
 
; NAmE
 
(North American English, informal, disapproving)
 
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a person who criticizes or comments on an event after it has happened The quarterback directs the play in an American football match and matches are usually played at the weekend.
See the Oxford Advanced American Dictionary entry: Monday morning quarterback