Real Dictionary

hook
countable noun: A hook is a bent piece of metal or plastic that is used for catching or holding things, or for hanging things up.
verb: If you hook a fish, you catch it with a hook on the end of a line.
verb: If you hook one thing to another, you attach it there using a hook. If something hooks somewhere, it can be hooked there.
verb: If you hook your arm, leg, or foot round an object, you place it like a hook round the object in order to move it or hold it.

hook in American English
a curved or bent piece of metal, wood, etc. used to catch, hold, or pull something

hook in American English 1
noun: a curved or angular piece of metal or other hard substance for catching, pulling, holding, or suspending something

hook in American English 2
intransitive verb: to work as a prostitute

hook in British English
noun: a piece of material, usually metal, curved or bent and used to suspend, catch, hold, or pull something