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

bad hair day

noun
 
/ˌbæd ˈheə deɪ/
 
/ˌbæd ˈher deɪ/
(informal)
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  1. a day on which everything seems to go wrong
See bad hair day in the Oxford Advanced American Dictionary
trait
noun
 
 
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