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English definition of “inform against/on sb”

inform against/on sb

phrasal verb with inform     /ɪnˈfɔːm/ US  /-ˈfɔːrm/ verb [T]
If you inform on/against someone, you give the police information , usually secretly , about that person , showing that he or she has done something wrong : The terrorists said that anyone caught informing on them would be killed .Revealing secrets and becoming known
(Definition of inform against/on sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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