cave-in

noun
  1. 1

    The act of something collapsing or caving in.

    โ€œWe were warned away from the rickety old mine because of the danger of cave-ins.โ€

  2. 2

    The location where something has caved in.

    โ€œWe couldn't get past the cave in blocking the tunnel.โ€

  3. 3

    The act of relenting.

    โ€œIt was a cave in, but I let my child have a candy to shut her up.โ€

Source: https://en.wiktionary.org/wiki/cave%20in, https://en.wiktionary.org/wiki/cave-in