Couple \Cou"ple\, v. t. [imp. & p. p. Coupled (k?p"'ld); p. pr. & vb. n. Coupling (-l?ng).]

[F. coupler, fr. L. copulare. See Couple, n., and cf. Copulate, Cobble, v.]

1. To link or tie, as one thing to another; to connect or fasten together; to join.

Huntsman, I charge thee, tender well my hounds, . . . And couple Clowder with the deep-mouthed brach. --Shak.

2. To join in wedlock; to marry. [Colloq.]

A parson who couples all our beggars. --Swift.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Coupling \Coup"ling\ (-l?ng), n.

1. The act of bringing or coming together; connection; sexual union.

2. (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.

Source: Webster's Revised Unabridged Dictionary (1913)