to chaunt horses

from The Collaborative International Dictionary of English v.0.48

Chant \Chant\, v. i.
   1. To make melody with the voice; to sing. "Chant to the
      sound of the viol." --Amos vi. 5.
      [1913 Webster]

   2. (Mus.) To sing, as in reciting a chant.
      [1913 Webster]

   {To chant horses} or {To chaunt horses}, to sing their
      praise; to overpraise; to cheat in selling. See
      {Chaunter}. --Thackeray.
      [1913 Webster]