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a coupler shaped like the letter U with holes through each end so a bolt or pin can pass through the holes to complete the coupling; used to attach a drawbar to a plow or wagon or trailer etc.
a coupling that connects or disconnects driving and driven parts of a driving mechanism
an automotive power coupling
a coupling (as in a chain) that has one end that turns on a headed pin
an oblong metal coupling with a swivel at one end and an internal thread at the other into which a threaded rod can be screwed in order to form a unit that can be adjusted for length or tension
universal, universal joint
coupling that connects two rotating shafts allowing freedom of movement in all directions
a clutch (as on the rear wheel of a bicycle) that allows wheels to turn freely (as in coasting)
a clutch in which one part turns the other by the friction between them