1548, "dregs, leavings, muck," especially in East Anglia, "ooze left by flood" (this may be the original sense), perhaps borrowed from M.Du. sudse "marsh, bog," cognate with O.E. soden, pp. of seoþan (see seethe). Meaning "soapy water" dates from 1581; slang meaning "beer" first attested 1904.
in. to drink beer. : How 'bout going out and sudsing for a while?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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