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]

The Collaborative International Dictionary of English v.0.48:

coaching \coaching\ n.
   the job of a professional coach.

   Syn: coaching job.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

coaching
    n 1: the job of a professional coach [syn: coaching, coaching
         job]