It acted by means of a great weight fastened to the short arm of a lever, which, being let fall, raised the end of the long arm with great velocity, hurling stones with much force
[ "tre-by&-'shet, -b&-, ] (noun.) 15th century. From Old French trebuchets, trebuket et al. (modern trébuchet), from trabucher (“to overthrow”), from Latin trabuchare.