On a wooden mast, a circular disc (or sometimes a rectangle) of wood near or at the top of the mast, usually with holes or sheaves to reeve signal halyards; also a temporary or emergency place for a lookout. "Main" refers to the mainmast, whereas a truck on another mast may be called (on the mizzenmast, for example) "mizzen-truck".
A pivotingframe, one attached to the bottom of the bed of a railway car at each end, that rests on the axle and which swivels to allow the axle (at each end of which is a solid wheel) to turn with curves in the track; a bogie.
The part of a skateboard or roller skate that joins the wheels to the deck, consisting of a hanger, baseplate, kingpin, and bushings, and sometimes mounted with a riser in between.
Perhaps a shortening of truckle, related to Latin trochus from Ancient Greek τροχός.
From Middle English truken, troken, trukien, from Old English trucian, from Proto-West Germanic *trukōn, from Proto-Indo-European *derew-, *derwu-, from Proto-Indo-European *der-. Cognate with Middle Low German troggelen, Dutch troggelen, German dialectal truggeln.
From dialectal truck, truk, trokk, probably of North Germanic origin, compare Norwegian dialectal trokka, trakka, Danish trykke ("to press, press down, crush, squeeze"), Swedish trycka. More at thrutch.
From Middle English trukien, from unrecorded Anglo-Norman and Old French words (attested in Medieval Latin trocare, Spanish trocar), of Unknown origin.
Modern English dictionary
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