Untruss
Untruss , transitive verb
[1st pref. un- + truss.]
To loose from a truss, or as from a truss; to untie or unfasten; to let out; to undress. [Rare] — Dryden
Untruss , noun
One who untrussed persons for the purpose of flogging them; a public whipper. [Obsolete] — B. Jonson
Also: Untrusser