What is the meaning of tread?

noun

• A step in walking or running.
  • synonyms: pace, stride
• The grooved surface of a pneumatic tire.
• The part (as of a wheel or shoe) that makes contact with the ground.
• Structural member consisting of the horizontal part of a stair or step.

verb

• Put down or press the foot, place the foot.
  • usage: "For fools rush in where angels fear to tread"; "step on the brake"
  • synonyms: step
• Tread or stomp heavily or roughly.
  • usage: "The soldiers trampled across the fields"
  • synonyms: trample
• Crush as if by treading on.
  • usage: "tread grapes to make wine"
• Brace (an archer's bow) by pressing the foot against the center.
• Apply (the tread) to a tire.
• Mate with.
  • usage: "male birds tread the females"