Pronunciation: (kāv'in"), [key]
1. a collapse, as of anything hollow: the worst cave-in in the history of mining.
2. a place or site of such a collapse.
3. submission to something or someone previously opposed or resisted: His cave-in to such unreasonable demands shocked us.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.