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English definition of “informer”

informer

noun [C]     /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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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