tackle /tkl/ n. 1
[U] equipment used in a sport: We take fishing tackle on camping trips. 2
[C] (in US football) the act of knocking a player carrying the ball to the ground v. -led, -ling, -les 1
[I;T] (in US football) to knock a ball carrier down: A guard tackled the ball carrier. 2 fig.
[T] to begin a job with a lot of energy: I tackled the problem of lowering the company's costs.