Definition of lemming noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈlemɪŋ//
; NAmE NAmE//ˈlemɪŋ//
Wild mammals
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a small animal like a mouse, that lives in cold northern countries. Sometimes large groups of lemmings migrate (= 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 related entries: Wild mammals Word Originearly 18th cent.: from Norwegian and Danish; related to Old Norse lómundr.
See the Oxford Advanced American Dictionary entry: lemming