† foot dirtn.Obsoleterare the dregs or remnants of a liquid; = sense A. 18.
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the world > physical sensation > cleanness and dirtiness > dirtiness > pollution or defilement > [noun] > specific impurities > sediment > of oil
foot1687
foot dirt1811
sludge1920
1811 E. H. EastRep. Cases King's Bench13 523 Before..oil is delivered, it is the constant custom..for a broker..to attend to make a minute of the foot-dirt and water in each cask.