GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Shim (?), n.
   1. A kind of shallow plow used in tillage to break the ground, and clear it of weeds.
   
   [1913 Webster]
   
   
   2. (Mach.) A thin piece of metal placed between two parts to make a fit.
   
   [1913 Webster]