1. The horizontal part of a stair or step.
2. The part (as of a wheel or shoe) that touches the ground.
(Irregular preterit, past participle: trod, trodden).
1. To step or stomp heavily or roughly; SYN. trample.
2. To apply (the tread) to a tire.
3. To brace (an archer's bow) by pressing the foot against the center.
4. To crush as if by treading on, as of grapes.
5. To mate with, of male birds.