Source : Webster's Revised Unabridged Dictionary (1913)

Scot-free \Scot"-free"\ [?], a.
   Free from payment of scot; untaxed; hence, unhurt; clear;
   safe.

         Do as much for this purpose, and thou shalt pass
         scot-free.                               --Sir W.
                                                  Scott.

         Then young Hay escaped scot-free to Holland. --A. Lang.