kəˈlæps ˈkɹʌmbəl ˈkɹʌmpəl dɪˈkeɪ di.ˈkeɪ dɪˈlæp.ɪ.deɪt ˈtʌmbl̩ fall into decay or ruin The unoccupied house started to decay break or fall apart into fragments The cookies crumbled The Sphinx is crumbling fall apart the building crumbled after the explosion Negotiations broke down