to catch a fish with a hook:
I hooked a 20-pound salmon last week.
to fasten or hang something onto something else
fasten[always + adverb/preposition]
hook something onto/to something
Just hook the bucket onto the rope and lower it down.
to bend your finger, arm, or leg, especially so that you can pull or hold something else:
bend your finger/arm etc[always + adverb/preposition]
Ruth hooked her arm through Tony's.
He tried to hook his leg over the branch.
to succeed in making someone interested in something or attracted to something:
cigarette ads designed to hook young people
to connect a piece of electronic equipment to another piece of equipment or to an electricity supply [↪ hook-up]:
electronic equipment[always + adverb/preposition] also hook up
We've got a CD player, but it's not hooked up yet.
hook something together
Computers from different manufacturers can often be hooked together.
to throw or kick a ball so that it moves in a curve
hook up with somebody/somethingphrasal verb
to start having a sexual relationship with someone
to meet someone and become friendly with them [= meet up with]:
Did you ever hook up with Maisy while you were there?
to agree to work together with another organization for a particular purpose
to help someone get something that they need or want [= fix up with]:
Do you think you can hook me up with some tickets for tonight?