defoliate
/ˌdiːˈfəʊlɪeɪt/verb
with obj.
- remove leaves from (a tree, plant, or area of land), for agricultural purposes or as a military tactic（为农业或军事目的而）使（树木、植物或地区）落叶：
the area was defoliated and napalmed many times.
该地区被施放过落叶剂并被凝固汽油弹轰炸了许多次。
派生词
defoliation
noun词源
late 18th cent.: from late Latin defoliat- 'stripped of leaves'， from the verb defoliare, from de- (expressing removal)+folium 'leaf'.