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.
      [1913 Webster]

   2. To prepare for public examination by private instruction;
      to train by special instruction. [Colloq.]
      [1913 Webster]

            I coached him before he got his scholarship. --G.
                                                  Eliot.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "coached":
   accomplished, all ready, all set, armed, armed and ready,
   at concert pitch, booted and spurred, briefed, career, cocked,
   conversant, equipped, familiarized, finished, good and ready,
   groomed, in arms, in battle array, in readiness, in the saddle,
   informed, initiate, initiated, loaded, loaded for bear, mature,
   mobilized, on the mark, planned, practiced, prearranged, prepared,
   prepared and ready, prepped, primed, professional, provided,
   psyched up, ready, ready for anything, ripe, set, skilled,
   technical, trained, up in arms, vigilant, well-prepared