He had stumbled against a human being lying on the floor!
She took the cup, and then stumbled against him as someone pushed her from behind.
He stumbled back against the writing table, staring and trying not to turn red.
He stumbled back against the wall, lost his balance completely, and sat down hard.
She took a step backward, then another, and he stumbled against her.
He cried out in pain and stumbled back against the wall.
She jerked away from him and stumbled back against the door.
I stumbled and fell against the wall of the shower.
They know all the furniture in the dark, but me, I stumble against every chair and end table.
He had to step over legs, avoid stumbling against the heads.