chug
/tʃʌg; tʃʌɡ/ v
(-gg-)
1 [I] make the short dull repeated sound of an engine running slowly （发动机缓慢运转时）发出（持续而单调的）短声; 发出突突声.
2 (phr v) chug along, down, up, etc move steadily in the specified direction while making this sound （发出突突声朝某方向）稳稳行进
The boat chugged along the canal. 小船稳稳地顺著运河突突地航行. chug, n sound made by a chugging engine （发动机缓慢运转时发出的）突突声.