trebuchet
Trebuchet (noun) means a large medieval weapon with a swinging arm weighted at one end, used to attack castle walls.
Etymology
This word traces back to Old French trebuchet, also spelled trebuket among other forms (modern French trébuchet), which came from trebuchier (“to overthrow, topple”), itself formed from tres- and *buchier. That in turn goes back to Old French buc (“trunk of the body”), from Old Frankish *būk (“belly, trunk, torso”), from Proto-Germanic *būkaz (“belly, abdomen, trunk”), from Proto-Indo-European *bʰōw- (“to blow, swell”). It is cognate with Old High German būh (“belly”) and Old English būc (“belly, trunk”). See also bouk.