informer.
One who informs someone else about something.
Meaning & usage
One who informs someone else about something.
A person who tells authorities about improper or illegal activity.
Being an informer often meant living in fear.
The police relied on an informer to catch the gang.
One who informs, animates, or inspires.
Where this word comes from
Inherited from Middle English enformour, from Anglo-Norman enfourmour; equivalent to inform + -er.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.