[f. JUG sb.2 + -FUL.] As much as fills a jug. By a jugful (U.S. slang), by a great deal, ‘by a long chalk.’
1834. Downing, Mayday in N. Y. (Bartlett). Downingville is as sweet as a rose. But ’tain’t so in New-York, not by a jug-full.
1840. Haliburton, Clockm., Ser. III. xviii. (Farmer). The last mile … took the longest [time] to do it by a jugfull.
1893. Family Herald, 25 March, 335/2. She overturned a jugful [of milk] upon the large black pool [of ink].
