The Collaborative International Dictionary of English v.0.48:

Shut \Shut\, n.
   The act or time of shutting; close; as, the shut of a door.
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         Just then returned at shut of evening flowers.
                                                  --Milton.
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   2. A door or cover; a shutter. [Obs.] --Sir I. Newton.
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   3. The line or place where two pieces of metal are united by
      welding.
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   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.
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