Meaning of “inform against/on sb” in the English Dictionary

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"inform against/on sb" in British English

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inform against/on sb

phrasal verb with inform uk /ɪnˈfɔːm/ us /ɪnˈfɔːrm/ 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.

(Definition of “inform against/on sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)