Baccare: “baccare! you are marvellous forward,” Shr. II, 73 (Nares: "a cant word, meaning, go back, used in allusion to a proverbial saying, 'Backare, quoth Mortimer to his sow;' probably made in ridicule of some man who affected a knowledge of Latin without having it." cf. Notes and Queries II, 8, p. 527).