When someone hooks up a computer or other electronic machine, they connect it to other similar machines or to a central power supply. [VP n] ⇒ ...technicians who hook up computer systems and networks. [V n P] ⇒ He brought it down, hooked it up, and we got the generator going. [beV-ed P + to] ⇒ ...if the machine is hooked up to an apartment's central wiring system. [Also V n Pto n]
3. reciprocal phrasal verb
If one person, especially a musician, hooks upwith another, the two people startworking with each other. You can also say that two people hook up. [VPwith n] ⇒ Anthrax have hooked up with Public Enemy for a metal/rap version of 'Bring On The Noise'. [pl-n VP] ⇒ Seeing as how we got on so well together, it just seemed natural that we should hook up.