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Definition of Die off
1. Verb. Become extinct. "Dinosaurs died out" 
Definition of Die off
1. Verb. (idiomatic) To become extinct ¹
¹ Source: wiktionary.com
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1. Verb. Become extinct. "Dinosaurs died out" 
1. Verb. (idiomatic) To become extinct ¹
¹ Source: wiktionary.com