Meaning

noun wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk

verb feed pigs

verb drink large quantities of (liquid, especially alcoholic drink)

originFrom Middle English swilen (“to wash; swirl; wash away”), from Old English swillan, swilian (“to wash; wash down; swill; gargle”), from Proto-West Germanic *swilljan, from Proto-Germanic *swiljaną (“to gulp, swallow”), from Proto-Indo-European *swel- (“to drink, gulp, swallow”). Related to swallow.

Etymology from Wiktionary, CC BY-SA 3.0