Etymology
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swill (v.)

Old English swilian, swillan "to wash out, gargle," probably from Proto-Germanic *swil-, related to the root of swallow (v.). Meaning "drink greedily" is from 1530s. Related: Swilled; swilling.

swill (n.)

"liquid kitchen refuse fed to pigs," 1550s, from swill (v.).

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Definitions of swill
1
swill (v.)
feed pigs;
Synonyms: slop
swill (v.)
drink large quantities of (liquid, especially alcoholic drink);
Synonyms: swill down
2
swill (n.)
wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk;
Synonyms: slop / slops / pigswill / pigwash
From wordnet.princeton.edu