Oxford Advanced American Dictionary

Definition of hook noun from the Oxford Advanced Learner's Dictionary

Oxford3000

hook

noun
hook pronunciation English hʊk hook pronunciation American hʊk
 
1 a curved piece of metal, plastic or wire for hanging things on, catching fish with, etca picture/curtain/coat hooka fish hookHang your towel on the hook. see also boathook2 (in boxing) a short hard blow that is made with the elbow benta left hook to the jaw3 (in cricket and golf) a way of hitting the ball so that it curves sideways instead of going straight ahead4 a thing that is used to make people interested in somethingThe images are used as a hook to get children interested in science.Well-chosen quotations can serve as a hook to catch the reader's interest.
Idioms

by hook or by crook

using any method you can, even a dishonest one

get (somebody) off the hook

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let somebody off the hook

to free yourself or somebody else from a difficult situation or a punishment

hook, line and sinker

completely
What I said was not true, but he fell for it (= believed it) hook, line and sinker.

off the hook

if you leave or take the telephone off the hook, you take the receiver (= the part that you pick up) off the place where it usually rests, so that nobody can call you
more at ring off the hook at ring2 verb, sling your hook at sling verb