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dobber

noun [C]
 
 
/ˈdɒb.ər/ US  /ˈdɑː.bɚ/ Australian English informal disapproving

Definition

a person who secretly tells someone in authority that someone else has done something wrongPeople who reveal secrets and tell tales → Compare sneak noun, telltale noun
(Definition of dobber noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of dobber