The Collaborative International Dictionary of English v.0.48:

Coach \Coach\, v. t. [imp. & p. p. Coached; p. pr. & vb. n.
   Coaching.]
   1. To convey in a coach. --Pope.
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   2. To prepare for public examination by private instruction;
      to train by special instruction. [Colloq.]
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            I coached him before he got his scholarship. --G.
                                                  Eliot.
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