1.
see hook 7
2.
When someone hooks up a computer or other electronic machine, they connect it to other similar machines or to a central power supply.
...technicians who ~ computer systems and networks...
He brought it down, hooked it up, and we got the generator going.
...if the machine is hooked up to an apartment’s central wiring system.
PHRASAL VERB: V P n (not pron), V n P, be V-ed P to n