stumble over something
stumble at something
stumble through something

When he could speak again, words stumbled over each other.

At one point, I stumbled and fell over the line.

I took a step back, almost stumbling over my own feet.

He took a step forward, stumbled over one body, fell on another.

He stumbled over something and fell head first into the water.

He stumbled a little over the words which did not come easily.

It was hard to walk without stumbling over your own feet.

She stumbled back over her own foot, into the river.

To a man they stumbled over one another to distance themselves from us.

I made my way to the kitchen without stumbling over anything.