mid-15c., "two-wheeled cart," earlier an instrument of punishment of uncertain type (early 13c.), from Old French tumberel "dump cart," from tomber "(let) fall or tumble," possibly from a Germanic source (cf. Old Norse tumba "to tumble," Old High German tumon "to turn, reel;" see tumble). Notoriously used to take victims to the guillotine during the Reign of Terror.