verb
ADVERB
▪ slowly , steadily
▪
The train chugged steadily along the West Highland Line.
PREPOSITION
▪ along , down , in , out , past , etc.
▪
The boat chugged slowly down the river.
Chug is used with these nouns as the subject: ↑ train
Chug is used with these nouns as the object: ↑ beer