The action of attaching, joining, binding, or linking; the state or fact of being attached, joined, or bound; union, conjunction; combination. Now…

The fact or quality of being pertinent (in various senses); esp. relevance; appositeness.

Firm fixing or attachment.

The fact or condition of being physically attached or linked to something; (Chemistry) bonding.

with up: To harness, yoke; absol. ‘To harness a horse to a vehicle, make ready for driving’ (Cent. Dict.). U.S. So hitch to (Australian).