What is Hook ?
Hook is (noun) 1. a bent piece of metal for hanging things on Hang your coat on the hook behind the door. 2. a very small piece of bent metal, attached to a line for catching fish The fish ate the worm but didn’t swallow the hook. to get someone off the hook to get someone out of a difficult situation She got him off the hook by lying to his boss. 3. (in boxing or cricket.) a blow or stroke made with your arm bent (verb) 1. to hang something on a hook or attach something with a hook She hooked the curtains back to let in more light. 2. (in cricket.) to hit the ball with your arm bent He hooked the next ball over the heads of the fielders.
source: Easier English, Student Dictionary Upper Intermediate Level