inform on/against

idiom

Definition of inform on/against

: to give information about the secret or criminal activity of (someone) to the police Despite pressure from the police he refused to inform on the other conspirators.

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“Inform on/against.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/inform%20on%2Fagainst. Accessed 9 December 2019.

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