A colloquial term which refers to the central member of a vee relationship. The hinge is the pivotal person in the relationship, he/she is bonded to each of the other members of the vee more than they are to one another.
The hinge is critical to the success of the vee and it will often fall apart if the hinge decides to remove themselves from the relationship.
When Jessica decided to move to Bangkok, both Lenny and Carl knew that the vee relationship was ending. Jessica was the hinge in their relationship and without her, there wasn’t going to be a relationship.