a piece of metal or other hard material curved or bent back at an angle, for catching hold of or hanging things on

a picture hook

a thing designed to catch people's attention

companies are looking for a sales hook

a curved cutting instrument, especially as used for reaping or shearing

a short swinging punch made with the elbow bent and rigid, especially in boxing

a perfectly timed right hook to the chin

a curved stroke in handwriting

a curved promontory or sand spit

attach or fasten with a hook or hooks

the truck had a red lamp hooked to its tailgate

inside the pack you'll find a small metal clip that hooks over the edge of your sun visor

catch with a hook

he hooked a 24 lb pike

attract and hold the attention of; captivate

I was hooked by John's radical zeal

hit (the ball) round to the on side with a horizontal or slightly upward swing of the bat at shoulder height; hit a ball delivered by (the bowler) with such a stroke

secure (the ball) and pass it backwards with the foot in the scrum