The Collaborative International Dictionary of English v.0.48:

Inform \In*form"\, v. t.
   1. To take form; to become visible or manifest; to appear.
      [Obs.]
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            It is the bloody business which informs
            Thus to mine eyes.                    --Shak.
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   2. To give intelligence or information; to tell. --Shak.
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            He might either teach in the same manner, or inform
            how he had been taught.               --Monthly Rev.
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   To inform against, to communicate facts by way of
      accusation against; to denounce; as, two persons came to
      the magistrate, and informed against A.
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