tread (Noun) — A step in walking or running.
tread (Noun) — The grooved surface of a pneumatic tire.
tread (Noun) — The part (as of a wheel or shoe) that makes contact with the ground.
tread (Noun) — Structural member consisting of the horizontal part of a stair or step.
tread (Noun) — The top of a step on a staircase.
tread (Verb) — Put down or press the foot, place the foot. ex. "For fools rush in where angels fear to tread"
tread (Verb) — Walk heavily or roughly. ex. "The soldiers trod across the fields"
tread (Verb) — Crush as if by treading on. ex. "tread grapes to make wine"
tread (Verb) — Brace (an archer's bow) by pressing the foot against the centre.
tread (Verb) — Apply (the tread) to a tire.
tread (Verb) — Mate with. ex. "male birds tread the females"