|Origin:||Probably from a Scandinavian language|
to hit your foot against something or put your foot down awkwardly while you are walking or running, so that you almost fall [= trip]:
In her hurry she stumbled and spilled the milk all over the floor.
Vic stumbled over the step as he came in.
to walk in an unsteady way and often almost fall [= stagger]
stumble in/out/across etc
He stumbled upstairs and into bed.
to stop or make a mistake when you are reading to people or speaking
I hope I don't stumble over any of the long words.
—stumble noun [countable]
stumble on/across/upon somethingphrasal verb
Researchers have stumbled across a drug that may help patients with Parkinson's disease.