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English definition of “inform against/on sb”

inform against/on sb

verb [T] uk phrasal verb with inform   /ɪnˈfɔːm/ us    /-ˈfɔːrm/
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.
(Definition of inform against/on sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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