Informer

noun

Definitions

Noun
  1. 1
    One who informs someone else about something.
  2. 2
    one who reveals confidential information to the police or other authority wordnet
  3. 3
    A person who tells authorities about improper or illegal activity.

    "Being an informer often meant living in fear."

  4. 4
    One who informs, animates, or inspires.

    "1729, Alexander Pope, Prologue to Sophonisba (by James Thomson Nature, informer of the poet's art."

Etymology

Inherited from Middle English enformour, from Anglo-Norman enfourmour; equivalent to inform + -er.

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