To drink greedily or carelessly; liquid refuse or poor-quality alcoholic drink.
From Old English swillan (to wash, rinse), related to swallow. The sense evolved from washing/rinsing to drinking sloppily, then to poor-quality liquid.
Swill perfectly captures the sound and action it describes - the 'sw' beginning mimics the sloshing liquid sound, while the word's journey from 'washing' to 'drinking badly' reflects how language often connects cleanliness with proper behavior.
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