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English definition of “informer”

informer

noun [C] uk   /ɪnˈfɔː.mər/ us    /-ˈfɔːr.mɚ/
a person who gives information in secret, especially to the police: Most police informers receive a reward for their information.People who reveal secrets and tell tales
(Definition of informer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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