Definition of man flu noun from the Oxford Advanced Learner's Dictionary

 

man flu

 noun
noun
BrE BrE//ˈmæn fluː//
 
; NAmE NAmE//ˈmæn fluː//
 
[uncountable](informal, humorous)
 
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a cold or similar minor illness that a man catches and treats as if it were flu or something more serious Greg was off sick with man flu, according to his wife.