/ tʃʌg; NAmE / verb , noun
■ verb ( -gg- )
1.
[ v , usually + adv. / prep. ] to move making the sound of an engine running slowly :
The boat chugged down the river.
2.
[ vn ] ( NAmE , slang ) to drink all of sth quickly without stopping
■ noun
the sound made by a chugging engine
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WORD ORIGIN
verb sense 1 and noun mid 19th cent. (as a noun): imitative.
verb sense 2 1980s: imitative.