Source : Webster's Revised Unabridged Dictionary (1913)

Rig \Rig\, n. [Cf. {Wriggle}.]
   1. A romp; a wanton; one given to unbecoming conduct. [Obs.]
      --Fuller.

   2. A sportive or unbecoming trick; a frolic.

   3. A blast of wind. [Prov. Eng.] --Wright.

            That uncertain season before the rigs of Michaelmas
            were yet well composed.               --Burke.

   {To run a rig}, to play a trick; to engage in a frolic; to do
      something strange and unbecoming.

            He little dreamt when he set out Of running such a
            rig.                                  --Cowper.