n.[C]

1. 沟，沟渠
   They dug trenches to keep the forest fire from spreading.

   他们挖沟以阻止森林大火蔓延。

2. 战壕
3. 堑壕阵地[P]
   The soldiers fought in trenches for ten days.

   士兵们在堑壕阵地上打了十天仗。

4. 海沟；地沟

vt.

1. 在……挖沟；在……挖战壕
   They were busy trenching the fields for draining.

   他们忙着在田里开沟排水。

2. 筑壕防卫
   The troops received orders to trench the outpost.

   部队接到命令在前哨周围筑壕加强防卫。

3. 切；刻

vi.

1. 挖沟；挖战壕
2. 侵害，侵占[（+on/upon）]
   The local despot trenched on the temple's property.

   当地恶霸侵占了寺庙的庙产。

n.

1. a long, narrow ditch.
   ▸a ditch of this type dug by troops to provide shelter from enemy fire.
2. (also ocean trench) a long, narrow, deep depression in the ocean bed, typically running parallel to a plate boundary and marking a subduction zone.

v.

1. dig a trench or trenches in.
2. (trench on/upon) archaic border closely on; encroach upon.