Etymology
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suds (n.)

1540s, "dregs, leavings, muck," especially in East Anglia, "ooze left by flood" (according to OED this may be the original sense), perhaps borrowed from Middle Dutch sudse "marsh, bog," or related words in Frisian and Low German, cognate with Old English soden "boiled," from Proto-Germanic *suth-, from PIE *seut- "to seethe, boil" (see seethe). Meaning "soapy water" dates from 1580s; slang meaning "beer" first attested 1904. Related: Sudsy.

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Definitions of suds
1
suds (v.)
wash in suds;
suds (v.)
make froth or foam and become bubbly;
Synonyms: froth / spume
2
suds (n.)
the froth produced by soaps or detergents;
Synonyms: soapsuds / lather
suds (n.)
a dysphemism for beer (especially for lager that effervesces);
From wordnet.princeton.edu