coupling >> /ˈkəp(ə)lɪŋ/
Definition: [noun] A device for connecting parts of machinery.
Example: undo the couplings so you can lift the pump out
Definition: [noun] The pairing of two items.
Example: the coupling of coaching and personal training
Definition: [noun] The action of mating or having sexual intercourse.
Example: This capacity, when combined with coupling between peak sexual desire and peak fertility, ensures that sex effectively serves both reproductive and social ends.