† underˈstumble,v.colloq.Obs. [Alteration of understand v., after stumble v. Cf. undercumstumble v.] trans. To understand. c1681Hickeringill Trimmer vi. Wks. 1716 I. 386 Oh! ho! I begin to understumble you, Edad, I will not tell you.1738Swift Polite Conv. 105, I understumble you, Gentlemen.