The act of something collapsing or caving in.
We were warned away from the rickety old mine because of the danger of cave-ins.
The location where something has caved in.
We couldn't get past the cave in blocking the tunnel.
The act of relenting.
It was a cave in, but I let my child have a candy to shut her up.
To collapse inward or downward.
He caved-in the side of the barrel with a single well-placed kick.
To relent; to grant approval against one's initial will.
After he asked me a few times, I finally caved in and had a slice of cake.