Chug
来自Big Physics
mid 19th century (as a noun): imitative.
wiktionary
Onomatopoeic.
blend of chihuahua and pug
blend of charity and mug
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
etymonline
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.
