The Collaborative International Dictionary of English v.0.48:

Amit \A*mit"\, v. t. [L. amittere, amissum, to lose; a (ab) +
   mittere to send. See Missile.]
   To lose. [Obs.]
   [1913 Webster]

         A lodestone fired doth presently amit its proper
         virtue.                                  --Sir T.
                                                  Browne.
   [1913 Webster]