n.

1. （树等的）液，汁[U]
   The weather was warming up and the sap was rising in the maples.

   天气在转暖，槭树的树液在上升。

2. 精力，元气[U]
   The world's whole sap is sunk.

   整个世界元气大伤。

3. （树皮和心材之间的）边材[U]
4. 【美】【口】笨蛋[C]
   You don't know what a sap she is.

   你不知道她有多笨。

   Don't you know I was kidding, you sap?

   笨蛋，你不知道我是在开玩笑吗？

5. 【美】（中间灌铅的）橡皮棍[C]

vt.

1. 使大伤元气
   The long walk sapped the old lady's strength.

   长途跋涉耗尽了老太太的体力。

2. 使干枯

vt.

1. 在……下挖掘；破坏……的基础
   The houses were sapped by floods.

   这些房屋被洪水毁坏。

2. 在……下挖掘坑道
3. 削弱，逐渐消耗
   The intense heat sapped her strength.

   酷暑消耗了她的体力。

vi.

1. 挖掘坑道
2. 挖坑道靠近敌方

n.

1. 坑道；（坑道的）挖掘[C][U]
   They pushed forward saps into No Man's Land.

   他们把坑道向无人地带推进。

2. 削弱，破坏

n.

1. the fluid, chiefly water with dissolved sugars and mineral salts, circulating in the vascular system of a plant.
2. vigour or energy.

v.

n.

v.

1. historical dig a sap.
2. archaic make insecure by removing the foundations.
3. [often as noun sapping] Geography  undercut by water or glacial action.

n.

n.

v.