Source : Webster's Revised Unabridged Dictionary (1913)

Untruss \Un*truss"\, v. t. [1st pref. un- + truss.]
   To loose from a truss, or as from a truss; to untie or
   unfasten; to let out; to undress. [R.] --Dryden.

Untruss \Un*truss"\, Untrusser \Un*truss"er\, n.
   One who untrussed persons for the purpose of flogging them; a
   public whipper. [Obs.] --B. Jonson.