Definition of lemming noun from the Oxford Advanced American Dictionary

 

lemming

 noun
noun
NAmE//ˈlɛmɪŋ//
 
 
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a small animal like a mouse, that lives in cold northern countries. Sometimes large groups of lemmingsmigrate (= move from one place to another) in search of food. Many of them die on these journeys and there is a popular belief that lemmings kill themselves by jumping off cliffs Lemming-like we rushed into certain disaster.
See the Oxford Advanced Learner's Dictionary entry: lemming