A quick or large drink of a beverage, especially an alcoholic one, often taken directly from the bottle.
Likely from German or Dutch origin, related to words meaning 'to drink quickly'; entered English in the 1600s with the sense of drinking heartily or in gulps.
The word 'swig' is onomatopoetic in a way—the hard 'sw' sound and the short vowel actually mimic the quick gulping motion of taking a drink in one go.
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