Definition of tumbril:
(n) :
A cart well suited to dumping its load easily, being single-axled and also often having a hinged tailboard.
(n) :
(historical) A cart used to carry condemned prisoners to their death, especially to the guillotine during the French Revolution.
(n) :
(historical) A kind of medieval torture device, later associated with a ducking stool.
(n) :
(UK, obsolete) A basket or cage of osiers, willows, or the like, to hold hay and other food for sheep.