English

Definition of bad hair day noun from the Oxford Advanced Learner's Dictionary

 

bad hair day

 noun
noun
BrE BrE//ˌbæd ˈheə(r) deɪ//
 
; NAmE NAmE//ˌbæd ˈher deɪ//
 
(informal)
 
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a day on which everything seems to go wrong
See the Oxford Advanced American Dictionary entry: bad hair day