The Collaborative International Dictionary of English v.0.48:

Shet \Shet\, v. t. & i. [imp. Shet. (Obs. Shette (? or ?));
   p. pr. Shet; p. pr. & vb. n. Shetting.]
   To shut. [Obs. or Prov. Eng.] --Chaucer.
   [1913 Webster]