a thin slip or wedge of metal, wood, etc., for driving into crevices, as between machine parts to compensate for wear, or beneath bedplates, large stones, etc., to level them.
verb (used with object), shimmed, shimming.
to fill out or bring to a level by inserting a shim or shims.

1715–25; origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
shim (ʃɪm)
1.  a thin packing strip or washer often used with a number of similar washers or strips to adjust a clearance for gears, etc
2.  physics a thin strip of magnetic material, such as soft iron, used to adjust a magnetic field
vb , shims, shimming, shimmed
3.  (tr) to modify a load, clearance, or magnetic field by the use of shims
[C18: origin unknown]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"a slip of wood," 1723, a Kentish word, of unknown origin. Originally a piece of iron fitted to a plow for scraping soil; meaning "thin slip to fill up a space or raise a level" is from 1860. The verb meaning "to wedge up a surface by means of a shim" is attested from 1937.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for shimmed
Using these feet, the cabinets need not be shimmed or scribed to the floor for leveling.
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