Definitions

1. verb

to crumble or break down into small pieces, typically due to decay or wear

“The old castle walls had started to cumble over the centuries.”

2. verb

to give way or collapse under the weight or pressure of something

“The bridge cumbled under the weight of the heavy trucks.”

3. noun

a small piece or fragment that has crumbled or broken off from something

“There were crumbs of the cake scattered all over the floor, which were the result of it cumbles.”