floor heave

The floor heaved violently, flinging him forward onto his face.

His head began to whirl and the floor heaved up and down in front of him.

The floor heaved and rolled like a strong sea.

When the floor is still heaving, it's tough to take the long view.

The floor heaved with tiny dark shapes carrying off the eggs.

The floor again heaved upward a foot, then dropped back down.

Then the floor heaved under his feet and, on top of everything else, he had to frantically levitate.

The set had already begun, the floor was heaving.

The floor heaved once more and her footing gave way.

They all clung together as the floor bucked and heaved under their feet.