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English definition of “lemming”

lemming

noun [C] uk   /ˈlem.ɪŋ/ us  
an animal that looks like a large mouse and lives in cold northern areas. Lemmings migrate (= move from one place to another) in large groups and are often, but wrongly, thought to jump off cliffs together.Rodents and similar animals
(Definition of lemming from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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