hook1 S3 [countable]
a curved piece of metal or plastic that you use for hanging things on [↪ peg]:
Tom hung his coat on the hook behind the door.
a curved piece of thin metal with a sharp point for catching fish
to allow someone or help someone to get out of a difficult situation:
I wasn't prepared to let her off the hook that easily.
to leave or take the telephone receiver (=the part you speak into) off the part where it is usually placed so that no one can call you
5 American English
if your telephone is ringing off the hook, a lot of people are calling you
something that is attractive and gets people's interest and attention [= draw]:
You always need a bit of a hook to get people to go to the theatre.
if you are going to do something by hook or by crook, you are determined to do it, whatever methods you have to use:
The police are going to get these guys, by hook or by crook.
a way of hitting your opponent in boxing, in which your elbow is bent [↪ punch, jab]
if someone believes something hook, line, and sinker, they believe a lie completely