"So they are, but that's little comfort when the whole south wall could topple at a moment's notice."

From the east a wall of night was toppling over the world.

During a fire, floors can cave in and walls can topple.

The wall at the side toppled a moment later.

Around her, up and down Market Street, walls, chimneys, and entire buildings were toppling.

The wall gave under his straining heave and toppled away from him.

At one spot, right next to a bus stop, the wall has toppled and the boulders are piled in a heap.

A prominent widow had been crushed to death when the walls of a hotel toppled in on her.

In the arctic reaches of his mind, walls of ice toppled into the sea.

Around that time, the rear wall to their top-floor apartment suddenly toppled into the back yard.