(n) a step in walking or running
(n) structural member consisting of the horizontal part of a stair or step
(n) the part (as of a wheel or shoe) that makes contact with the ground
(n) the grooved surface of a pneumatic tire
(v) brace (an archer's bow) by pressing the foot against the center
(v) mate with; "male birds tread the females"
(v) crush as if by treading on; "tread grapes to make wine"
(v) tread or stomp heavily or roughly; "The soldiers trampled across the fields"
(v) put down or press the foot, place the foot; "For fools rush in where angels fear to tread"; "step on the brake"
(v) apply (the tread) to a tire