Another word for crumbling

There was not a single chamber in the old fabric that was not crumbling and tottering.

A cannon ball struck the very end of the earth work by which he was standing, crumbling down the earth; a black ball flashed before his eyes and at the same instant plumped into something.

The In the course of the next three years her empire warS seemed to be crumbling away everywhere.

In short, Hamilton took from recent years the lesson of the evils of lax government; whereas Jefferson clung to the other lesson, which crumbling colonial governments had illustrated, that governments derived their strength (and the Declaration had proclaimed that they derived their just rights) from the will of the governed.

They could've both gone somewhere else entirely, wherever they wanted to go, without the underworld crumbling or the pain Gabriel was in.