Verb (1-dan, intransitive)
1. to collapse; to crumble
2. to get out of shape; to lose one's shape; to become disorganized; to become untidy
3. to break down; to be thrown into disarray
4. to crash (stock market); to slump; to decline
5. to break money into small change
6. to turn bad (e.g. weather); to change for the worse; to deteriorate