\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.

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