There are 2 definitions of chug in English:

chug1

Line breaks: chug
Pronunciation: /tʃʌg
 
/

verb (chugs, chugging, chugged)

[no object, with adverbial of direction]
  • 1(Of a vehicle or boat) move slowly making regular muffled explosive sounds, as of an engine running slowly: 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.
  • 1.1 [no object] Make a series of muffled explosive sounds: 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.

noun

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  • A muffled explosive sound or sounds: the chug of a motor boat
    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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Definition of chug in:

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Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little

There are 2 definitions of chug in English:

chug2

Line breaks: chug
Pronunciation: /tʃʌɡ
 
/
(also chugalug)
North American informal

verb (chugs, chugging, chugged)

[with object]
  • Consume (a drink) in large gulps without pausing: she chugged a glass of cola
    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.

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 skosh
Pronunciation: skəʊʃ
noun
a small amount; a little