1. falling apart or deteriorating; in a state of decay or ruin

1. present participle of crumble; breaking or falling apart into small pieces
Usage: present participle form

Examples

• The old brick wall was crumbling after years of neglect.
• She watched the cookie crumbling in her hands.
• The crumbling castle attracted many tourists.
• The foundation is crumbling due to water damage.
• His crumbling marriage finally ended in divorce.
• The crumbling cliffs posed a danger to hikers.
• The ancient manuscript was crumbling with age.