the.com/liaison

means A go-between who links two people or groups, or the connection itself — whether that's a coordinating contact between organizations or a secret romantic entanglement.

from From French liaison, meaning a binding or linking together, from lier "to tie, to bind," descending from Latin ligare (same root that gives us 'ligament' and 'ligature'). It first did duty in cooking — a liaison is still the technical term for the egg-yolk-and-cream mixture that binds a sauce — and in phonetics, where it describes linking a silent final consonant to the next word's vowel. The military and diplomatic sense, a person stitching two wary sides together, and the romantic sense, an affair stitching two people together they probably shouldn't be stitched to, both grew naturally from the same image: something binding two things that would otherwise stay separate.