动词（使）落叶

1. 落叶的：defocusing 发散 | defoliate 落叶的 | defoliation 落叶

2. 除叶,使...落叶：deficient 缺少,不足 | defoliate 除叶,使...落叶 | deformation 变形,变态,形变,畸形

3. 落叶：defoliant 脱叶剂 | defoliate 落叶 | defoliation 落叶

4. 使落叶：defoliant 脱叶剂 | defoliate 使落叶 | defoliation 落叶

1. （尤指战时）使落叶，去掉…的叶子，毁坏(某一地区)的绿色植物
To defoliate an area or the plants in it means to cause the leaves on the plants to fall off or be destroyed. This is done especially in war to remove protection from an enemy.

e.g. Dioxin was the ingredient in Agent Orange, used to defoliate Vietnam.
越南战场上用于毁灭林区的“橙剂”，其成分是二氧杂芑。