noun

• (nautical) 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".
  "But oh! shipmates! on the starboard hand of every woe, there is a sure delight; and higher the top of that delight, than the bottom of the woe is deep. Is not the main-truck higher than the kelson is low?"
• (countable, uncountable, US, Canada, Australia) A heavier motor vehicle designed to carry goods or to pull a semi-trailer designed to carry goods; (in Malaysia/Singapore) a such vehicle with a closed or covered carriage.
  "We rented a truck big enough to carry the whole load in one trip."
• (UK, rail transport) A railroad car, chiefly one designed to carry goods.
• (US, rail transport) Abbreviation of railroad truck or wheel truck; a pivoting frame, 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.

verb

• (intransitive) To drive a truck.
  "My father has been trucking for 20 years."
• (transitive) To convey by truck.
  "Last week, Cletus trucked 100 pounds of lumber up to Dubuque."
• (intransitive, US, slang) To travel, to proceed.
  "I want to tell you a story from 'way back: / Truck on down and gig me, jack / In eighteen hundred and sixty-five / A hep cat started some jive / He said, "Come on, gates, and jump with me / At the Juneteenth Jamboree.""
• (intransitive, US, Canada, slang) To persist, to endure.
  "Keep on trucking!"

verb

• (intransitive, now chiefly dialectal) To fail; run out; run short; be unavailable; diminish; abate.
• (intransitive, now chiefly dialectal) To give in; give way; knuckle under; truckle.
• (intransitive, now chiefly dialectal) To deceive; cheat; defraud.

verb

• (transitive, UK dialectal, Scotland) To tread (down); stamp on; trample (down).