- an act or instance of caving in
- a place where the ground, a mine, etc. has caved in
See cave-in in American Heritage Dictionary 4
a. A collapse, as of a tunnel or structure.
b. A place where a cave-in has occurred.
- An act or instance of ceasing opposition or resistance: The vote was seen as a cave-in to the demands of the administration.
Learn more about cave-in