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English definition of “die out”

die out

phrasal verb with die     /daɪ/ verb [I] (present participle dying, past tense and past participle died)
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.Death and dying
(Definition of die out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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