old hat

noun
🔊/ˌəʊld ˈhæt/
🔊/ˌəʊld ˈhæt/
[uncountable]
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  1. something that is old-fashioned and no longer interesting陈腐的事物;过时的东西
    • Today's hits rapidly become old hat.今日红极一时的东西,很快就会过时。🔊🔊