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Definition of old hat noun from the Oxford Advanced Learner's Dictionary

old hat

noun
 
/ˌəʊld ˈhæt/
 
/ˌəʊld ˈhæt/
[uncountable]
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  1. something that is old-fashioned and no longer interesting
    • Today's hits rapidly become old hat.
See old hat in the Oxford Advanced American Dictionary
perspective
noun
 
 
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