下陷的英文：
cave in; settle; sink

参考例句：

sunken cheeks
下陷[消瘦]的脸颊

Become more compact; subside
变得更紧实或坚实;下陷

Thick accumulations of peat can form only if the swamp basin slowly subsides.
只有当沼泽盆地慢慢下陷时，厚厚的泥炭堆积才能形成。

The foundations have caved in.
地基下陷。

His cheeks have been swagged.
他的两腮都下陷了。

(of buildings,etc)sink lower into the ground
(指建筑物等)下陷

The chair seat had a slight sag.
椅子的座位略微下陷。

A slight depression or indentation in a surface.
凹痕表面上轻微的下陷或凹陷

The shelves sag under the weight of the books.
书架因书的重量而下陷。

(of land) ink, g because of mining operations underneath
（指土地）下陷（如因在地下采矿）

cave是什么意思：
n. 洞穴，地窖
v. （使）凹陷，塌落；在…挖洞穴；投降

They found a refuge in a cave.
他们避难于一个山洞中。

The guide flashed a light into the cave.
导游用手电筒照射洞穴。

The cave roof collapsed.
洞顶坍塌了。

settle是什么意思：
v. （使）定居，安定；解决；安排；沉淀；下陷

It was settled by lot.
这事是以抽签决定的。

It was settled by lotting.
这事是以抽签决定的。

No question is ever settled until it is settled right
正确解决问题才算真正解决

sink是什么意思：
v. （使）下沉；渐渐进入；淹没；消沉；渗透；挖掘
n. 洗涤槽

sink into a decline
开始衰落，衰弱下去，体力衰退

Sink or fall to a lower level.
下沉或下降到更低的水平。

swallow hold (sink, sinkhold)
落水洞