Source : Webster's Revised Unabridged Dictionary (1913)

Shut \Shut\, n.
   The act or time of shutting; close; as, the shut of a door.

         Just then returned at shut of evening flowers.
                                                  --Milton.

   2. A door or cover; a shutter. [Obs.] --Sir I. Newton.

   3. The line or place where two pieces of metal are united by
      welding.

   {Cold shut}, the imperfection in a casting caused by the
      flowing of liquid metal upon partially chilled metal;
      also, the imperfect weld in a forging caused by the
      inadequate heat of one surface under working.