crumble (v) – break down, fall apart, fall into ruin
crumbly (adj) – easily broken, very delicate
crumble (n) – pieces (small) of things that fell apart/broken
1. Many houses crumbled after the earthquake in Haiti.
2. Crumbly cookies are difficult to eat.
3. The building is gradually crumbling because of old age.
4. The ants enjoyed the cookie crumbles.
5. Her hopes crumbled after hearing the bad news.