to eat too much grass in an area or to have too many animals eating grass in an area, which damages the environment

The pasture land had little grass on it, indicating that it had been overgrazed. 牧场上几乎没有什么草，说明已经过度放牧。

We can keep two ponies in the field, as long as they don't overgraze it. 我们可以在田里养两匹小马，只要它们不啃食过多的草。