the lowest sill of a structure, usually placed in or on the ground.
Also called footplate.

1675–85; mud + sill Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1685, "lowest sill of a house," from mud + sill (q.v.). The word entered U.S. political history in a speech by James M. Hammond of South Carolina, March 4, 1858, in U.S. Senate, alluding to the very mudsills of society, and the term subsequently was embraced by Northern workers in the pre-Civil War sectional
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Base plates should be centered on the mudsill and secured to prevent movement.
The mudsill is tilted, to begin with, and the plates aren't fastened to it at all.
Protection of the existing floor by installing mudsill plate under jacks is required.
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