Etymology
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chug (n.)

1866, echoic of a working steam engine. As a verb, from 1884. Related: Chugged; chugging. Drinking sense attested by 1940s (chug-a-lug), probably imitative of the sound of swallowing.

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Definitions of chug
1
chug (v.)
make a dull, explosive sound;
the engine chugged down the street
2
chug (n.)
the dull explosive noise made by an engine;
From wordnet.princeton.edu