Part of speech: noun

One who informs against others; atelltale.

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Usage examples "informer":

  1. At last, it is said, the person who was going to carry to Artabazus the last letter for the King, a man of Argilus, once the favourite and most trusty servant of Pausanias, turned informer. - "The History of the Peloponnesian War", Thucydides.
  2. Hardly knowing how to credit this wild account, Pembroke asked his informer if she were serious. - "Thaddeus of Warsaw", Jane Porter.
  3. I really at first supposed that my informer meant seventeen years' purchase for every pound of interest, and I began to be almost jealous of revolutionary credit; but I soon found that he literally meant seventeen pounds for every hundred pounds capital stock of five per cent, that is, a little more than three and a half years' purchase. - "Selected-Speeches-on-British-Foreign-Policy-1738-1914", Jones, Edgar R. (Edgar Rees), Sir.