Meaning of “backstabber” in the English Dictionary

british dictionary

"backstabber" in British English

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backstabbernoun [ C ]

uk /ˈbækˌstæb.ər/ us /ˈbækˌstæb.ɚ/

someone who says harmful things about you when you are not there to defend yourself

(Definition of “backstabber” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)