Definition of "Tackle" :
noun: (American football) grasping an opposing player with the intention of stopping by throwing to the ground
noun: (American football) a position on the line of scrimmage
"It takes a big man to play tackle."
noun: gear used in fishing
noun: gear consisting of ropes etc. supporting a ship's masts and sails
noun: the person who plays that position on a football team
"The right tackle is a straight A student."
verb: seize and throw down an opponent player, who usually carries the ball
verb: put a harness
verb: accept as a challenge
"I'll tackle this difficult task."