I. ˈchəg noun
Etymology: imitative
Date: 1866
: a dull explosive sound made by or as if by a laboring engine
II. intransitive verb
( chugged ; chug·ging )
Date: 1848
: to move or go with or as if with chugs
a locomotive chugging along
wearily chug through the routine
• chug·ger noun
III. transitive verb
( chugged ; chug·ging )
Date: 1958
: chugalug