If the edge had crumbled, nothing would break his fall straight down to the rocks below.

Rachel took a step to look, and the edge crumbled under her.

The keen edges of my long discipline suddenly, painfully, crumbled.

Had the edge of the platform crumbled and let it through?

Most edges crumbled and rounded off as if exposed to storms and climate changes for millions of years.

The edge of the habitat's spaceport disk started to grey, then crumbled and broke apart with age.

She dropped the stack of papers on Johnny's desk; their edges, he saw, were yellowed and crumbling with age.

The edge of one page crumbled as she opened it once more.

The edges of real slate shingles crumble and round in a way that makes them look almost soft.

The edges crumbled, and the surface became pitted.