There are 2 definitions of chug in English:

chug1

Syllabification: chug
Pronunciation: /CHəg
 
/

verb (chugs, chugging, chugged)

[no object]
  • 1Emit a series of regular muffled explosive sounds, as of an engine running slowly: he could hear the pipes chugging
    More example sentences
    • I could hear machinery of some kind chugging away inside.
    • You can actually hear his brain make chugging noises when he thinks.
    • We hear the chugging, as it comes closer to the station.
  • 1.1(Of a vehicle or boat) move slowly with engine making regular muffled explosive sounds: a cabin cruiser was chugging down the river
    More example sentences
    • But all too soon the boat had chugged slowly past St Mark's Square, into the Grand Canal and up to the small landing stage a short amble from our hotel.
    • Although boats chugged up and down the water on a regular basis (the river was a designated highway), road access was limited.
    • Two battered motor vehicles chugged down one side of the street, throwing out huge clouds of dirty black smoke.

noun

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  • A muffled explosive sound or a series of such sounds: the chug of a motorboat
    More example sentences
    • AS THE chug of a train rumbles overhead, Andy Arnold takes a seat amid the lunchtime bustle of the Arches theatre bar in Glasgow's city centre.
    • She brushed aside branches, following the chug of an unseen train that got louder and louder until finally, another whistle sounded into the air.
    • Cobalt blue water lies around every bend and at dawn you'll have the chug chug of the lobster fleet for an alarm clock.

Origin

mid 19th century (as a noun): imitative.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space

There are 2 definitions of chug in English:

chug2

Syllabification: chug
Pronunciation: /
 
CHəg/
(also chugalug or chug-a-lug /ˈCHəgəˌləg/)
North American informal

verb (chugs, chugging, chugged)

[with object]
  • Consume (a drink) in large gulps without pausing: Avery chugged a cup of coffee
    More example sentences
    • Vinny brought the plastic cup of beer to his mouth and tipped his head back, gulping nervously, chugging the entire beverage in just a few slurps.
    • Unfortunately, I hate black jelly beans, and I thought it tasted nasty, so I wound up chugging my drinks, which is really not the point of absinthe.
    • It made recycling very easy to find, and if you wanted to just stand there and chug your drink, it was very easy to then recycle the bottle.
    Synonyms
    gulp, guzzle, quaff
    informal swig

noun

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  • A large gulp of a drink: Chris took a long chug of his beer
    More example sentences
    • The Earl took a hefty chug of brandy from his bottle.
    • He lifted the brown glass bottle and took a long, gulping chug.
    • Well, join me later on, and there will be chug by chug updates.

Origin

1950s: imitative.

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Definition of chug in:

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space