Meaning of “dobber” in the English Dictionary

british dictionary

"dobber" in British English

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dobbernoun [ C ]

uk /ˈdɒb.ər/ us /ˈdɑː.bɚ/ Australian English informal disapproving

a person who secretly tells someone in authority that someone else has done something wrong

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