informer

Meanings

1. 1
   noun

   A person who tells authorities about improper or illegal activity.

   Being an informer often meant living in fear.

2. 2
   noun

   One who informs, animates, or inspires.

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

3. 3
   noun

   one who reveals confidential information in return for money

4. 4
   noun

   One who informs someone else about something.

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

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