overgraze
/ˌəʊvəˈgreɪz/verb
with obj.
- graze (grassland) so heavily that the vegetation is damaged and the ground becomes liable to erosion在（草原）上过度放牧：
their own pastures were overgrazed and arid
他们自己的草地放牧过度而且干旱
as noun overgrazing the failure of the rains led to overgrazing and deforestation.雨水不足导致过度放牧和森林面积减少。