Hypertext Webster Gateway: "shim"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Shim \Shim\, n.
1. A kind of shallow plow used in tillage to break the
ground, and clear it of weeds.
2. (Mach.) A thin piece of metal placed between two parts to
make a fit.
From WordNet (r) 1.7 (wn)
shim
n : a thin wedge of material (wood or metal or stone) for
driving into crevices
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