Definition of hook:
(n) :
a
rod bent into a
curved shape, typically with one end free and the other end secured to a rope or other attachment; a
fishhook, a barbed metal hook used for fishing
"the song's hook snared me."
(v) :
to
attach a hook to; to
catch with a hook (hook a fish)
"hook the bag here, and the conveyor will carry it away."