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English definition of “die out”

die out

verb [I] uk phrasal verb with die   /daɪ/ (present participle dying, past tense and past participle died) us  
B2 to become less common and finally stop existing: Dinosaurs died out millions of years ago. It's a custom that is beginning to die out.
(Definition of die out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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