cave-in

名词 cave-in:

1. the sudden collapse of something into a hollow beneath it
   同义词：cave in, subsidence

动词 cave-in:

1. break down, literally or metaphorically
   同义词：collapse, fall in, cave in, give, give way, break, founder

cave-in

n.（名词）

A collapse, as of a tunnel or structure.
坍陷：坍陷，如隧道或建筑的塌陷
A place where a cave-in has occurred.
坍陷处：出现塌陷的地方
An act or instance of ceasing opposition or resistance:
投降：终止反对或抵抗的行动或情况：
例句：
The vote was seen as a cave-in to the demands of the administration.
选举被看作是对管理要求的投降