tread

tread (http://definr.com/tread)

     n 1: a step in walking or running [syn: pace, stride]
     2: the part (as of a wheel or shoe) that makes contact with the
        ground
     3: structural member consisting of the horizontal part of a
        stair or step
     v 1: put down the foot, place the foot; "For fools rush in where
          angels fear to tread" [syn: step]
     2: tread or stomp heavily or roughly; "The soldiers trampled
        across the fields" [syn: trample]
     3: crush as if by treading on, as of grapes
     4: brace (an archer's bow) by pressing the foot against the
        center
     5: apply (the tread) to a tire
     6: mate with, of male birds