Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: From the sound

chug

verb
     
chug past tense and past participle chugged, present participle chugging
1 [intransitive always + adverb/preposition] if a car, train etc chugs somewhere, it moves there slowly, with the engine making a repeated low sound
chug along/up/around etc
The boat chugged out of the harbour.
2 [transitive] also chug-a-lug American English informal to drink all of something in a glass or bottle without stopping
3 [intransitive always + adverb/preposition] to make slow but steady progress:
The economy just keeps chugging along.
chug noun [countable usually singular]

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