The Collaborative International Dictionary
Thill coupling
Thill \Thill\, n. [OE. thille, AS. ?ille a board, plank, beam, thill; akin to ?el a plank, D. deel a plank, floor, G. diele, OHG. dili, dilla, Icel. ?ilja a plank, planking, a thwart, ?ili a wainscot, plank; cf. Skr. tala a level surface.
One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft.
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(Mining) The floor of a coal mine.
--Raymond.Thill coupling, a device for connecting the thill of a vehicle to the axle.