Underpitch \Un`der*pitch"\, v. t. [imp. {Underpight}.] [OE. underpicchen. See {Under}, and {Pitch} to throw, fix.] To fill underneath; to stuff. [Obs.] He drank and well his girdle underpight. --Chaucer. Underpight \Un`der*pight"\, imp. of {Underpitch}.