[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
[v] brace (an archer's bow) by pressing the foot against the center
[v] mate with, of male birds
[v] crush as if by treading on, as of grapes
[v] tread or stomp heavily or roughly; "The soldiers trampled across the fields"
[v] put down the foot, place the foot; "For fools rush in where angels fear to tread"
[v] apply (the tread) to a tire