I stumbled across an old photo album while cleaning out the attic.

I was stumbling across old photos when I found a picture of my grandparents.

There are many stumbling-blocks on the path to success.

The stumbling-stone in the garden caused me to trip and fall.

He stumbles upon a hidden treasure in the forest.

I stumbled against the table and knocked over a glass.

He stumbles against the chair.

He was stumbling against the furniture in the dark.

I saw the stumbling stones in the memorial park.