swill (n.) Look up swill at Dictionary.com
"liquid kitchen refuse fed to pigs," 1550s, from swill (v.).
swill (v.) Look up swill at Dictionary.com
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.