confidential informant

[ kon-fi-den-shuhl in-fawr-muhnt ]
/ ˌkɒn fɪˈdɛn ʃəl ɪnˈfɔr mənt /

noun

a person who works undercover for law enforcement to gather information about felonious criminal activities: some confidential informants are criminals themselves, hired to work undercover in exchange for leniency or exoneration: We’re told that this elusive drug lord was finally taken down thanks largely to a confidential informant, whose identity remains fiercely protected.Abbreviation: CI

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Origin of confidential informant

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020