The Collaborative International Dictionary
Coupling \Coup"ling\ (-l?ng), n.
The act of bringing or coming together; connection; sexual union.
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(Mach.) A device or contrivance which serves to couple or connect adjacent parts or objects; as, a belt coupling, which connects the ends of a belt; a car coupling, which connects the cars in a train; a shaft coupling, which connects the ends of shafts.
Box coupling, Chain coupling. See under Box, Chain.
Coupling box, a coupling shaped like a journal box, for clamping together the ends of two shafts, so that they may revolve together.
Coupling pin, a pin or bolt used in coupling or joining together railroad cars, etc.
Usage examples of "coupling pin".
It ripped loose with a terrific wrench, almost derailing the flatcar and pulling loose the coupling pin, which had been poorly seated.
Ella and Kate went in with Griffin and you could of knocked me over with a coupling pin when the Mrs.
Using makeshift tools, they soon were able to work the coupling pin loose.