tread in WordNet English dictionary

1. a step in walking or running
   pace  stride  tread 
   
2. structural member consisting of the horizontal part of a stair or step
   tread 
   
3. the part (as of a wheel or shoe) that makes contact with the ground
   tread 
   
4. the grooved surface of a pneumatic tire
   tread 
   

1. put down or press the foot, place the foot
   "For fools rush in where angels fear to tread"; "step on the brake"
   step  tread 
   
2. tread or stomp heavily or roughly
   "The soldiers trampled across the fields"
   tread  trample 
   
3. crush as if by treading on
   "tread grapes to make wine"
   tread 
   
4. brace (an archer's bow) by pressing the foot against the center
   tread 
   
5. mate with
   "male birds tread the females"
   tread 
   
6. apply (the tread) to a tire
   tread