Definitions

1. verb

to break or become broken into small fragments; to walk with a stiff or uneven gait

“The old stone wall had begun to crumble and crumble.”

2. noun

a rough or uneven surface of stones or broken brick

“The path through the woods had a long stretch of crumble.”

3. verb

to walk with a stiff or uneven gait

“She began to crumble after walking for hours.”