The Collaborative International Dictionary of English v.0.48:

Tabor \Ta"bor\, v. i. [imp. & p. p. Tabored; p. pr. & vb. n.
   Taboring.] [Cf. OF. taborer.] [Written also tabour.]
   1. To play on a tabor, or little drum.
      [1913 Webster]

   2. To strike lightly and frequently.
      [1913 Webster]