undercumˈstand,v.dial. [Alteration of understand.] To understand. 1824Carr Craven Dial. 39. 1840 Haliburton Clockm.Ser. iii. iii. 39 Six bottles of iced champaigne,..then two dollars for tickets, makes a total of twenty-five dollars; do you undercumstand?1869–in northern dial. glossaries.