S: (n) coupling, coupler (a mechanical device that serves to connect the ends of adjacent objects)
S: (n) coupling, mating, pairing, conjugation, union, sexual union (the act of pairing a male and female for reproductive purposes) "the casual couplings of adolescents"; "the mating of some species occurs only in the spring"
Verb
S: (v) match, mate, couple, pair, twin (bring two objects, ideas, or people together) "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"
S: (v) join (cause to become joined or linked) "join these two parts so that they fit together"
S: (v) connect, link, tie, link up (connect, fasten, or put together two or more pieces) "Can you connect the two loudspeakers?"; "Tie the ropes together"; "Link arms"