Definition from Wiktionary, the free dictionary
Alternative forms 
- 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.
- (idiomatic) The act of relenting.
- It was a cave in, but I let my child have a candy to shut her up.
- (act of collapse): breakage, collapse, rockfall
- (site of a collapse): blockage, collapse, rockfall
- (act of relenting): acquiescence, consent, sellout
The act of something collapsing or caving in
The location where something has caved in
The act of relenting
- To collapse inward or downward.
- The roof caved in under the weight of the snow.
- He caved-in the side of the barrel with a single well-placed kick.
- (idiomatic) To relent; to acquiesce; to comply; to grant approval; to lose willpower.
- I finally caved in and had a slice of cake.
- (to collapse in or down): break, crush, give way, stave, stave in
- (to acquiesce): assent, give in, give up, relinquish, yield
to collapse inward or downward