Past tense of chug; drank something quickly in large gulps, or made a series of sharp sounds like a train or engine.
From 'chug,' which originated as onomatopoeia in the 19th century mimicking the sound of steam engines. The meaning expanded to include drinking in a similar rapid, continuous manner.
The word 'chug' captures the sound of both a steam engine chugging down the tracks AND a person drinking—showing how onomatopoeia lets us describe actions that *sound* like what they are!
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