DICT.TW Dictionary Taiwan

 chug /ˈʧʌg/
 軋軋聲(vi.)發出軋軋聲,軋軋響著前進

 chug
      n : the dull explosive noise made by an engine
      v : make a dull, explosive sound; "the engine chugged down the
          street"
      [also: chugging, chugged]