陷下 meaning in English

plunge
sag

One wall of the temple hospital crumbled, the roof caved in .
这个小庙医院的一堵墙倒塌了，屋顶陷下了。
This time, a pair of haggard eyes had looked at the questioner, before the face had dropped again .
这时，一双陷下的眼睛望着问话者，然后那脸又低下去了。
Characteristics of buried hill reservoirs from lower palaezoic of jiyang depression
济阳坳陷下古生界潜山储集体特征