n.[C]

1. 洞穴，洞窟
   Our forefathers once lived in caves.

   我们的祖先曾在洞穴居住。

2. 塌落（处）

vt.

1. 在……挖洞穴
2. 使屈服；使崩溃
3. 使塌落；使内陷[（+in）]
   The top of the car was caved in by the impact.

   那个冲击使得车顶塌了。

vi.

1. 塌落，倒坍[（+in）]
   Our cellar caved during the earthquake.

   地震时，我们的地窖塌陷了。

2. 【口】屈服，投降[（+in）][（+to）]
   The school committee finally caved in to the demands of parents and teachers.

   在家长和老师的要求下，学校委员会最后终于屈服了。

n.

v.

1. explore caves as a sport.
2. (cave in or US also cave) (of a roof or walls) subside or collapse.

exclam.