n a step in walking or running
n the grooved surface of a pneumatic tire
n the part (as of a wheel or shoe) that makes contact with the ground
n structural member consisting of the horizontal part of a stair or step
v put down or press the foot, place the foot
v tread or stomp heavily or roughly
v crush as if by treading on
v brace (an archer's bow) by pressing the foot against the center
v apply (the tread) to a tire
v mate with