They were different sizes, and the boot slipped a little with each step.

His boot slipped on the edge of the broken wall.

There is no need to open them, because the boot slips onto the foot.

His boots slipped on the tiles, and he decided it might be a good idea to think about getting back down into the street himself.

His boot slipped and struck one of the side bars.

Then he had the right angle: The boot slipped from his foot.

His boots almost slipped on the wet moss of the other side.

His left boot slipped on the body of a dead comrade.

Then my boot, slipping across the ground, struck against some obstruction.

His boots slipped on the black stone floor as if it were glazed with ice.