coupling

noun
1
an action of joining or combining two things
اتصال, پیوند, جفت‌سازی, وصل, ترکیب
2
an act of having sex
آمیزش, همخوابگی
illicit couplings
3
a thing that joins together two parts of something, two vehicles or two pieces of equipment
اتصال, کوپلینگ, جفت‌سازی
The coupling was designed to fit the grooves in the pipe.