Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Probably from a Scandinavian language

stumble

verb
     
stum‧ble [intransitive]
1 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.
stumble over/on
Vic stumbled over the step as he came in.
2 to walk in an unsteady way and often almost fall [= stagger]
stumble in/out/across etc
He stumbled upstairs and into bed.
3 to stop or make a mistake when you are reading to people or speaking
stumble over/at/through
I hope I don't stumble over any of the long words.
stumble noun [countable]

stumble on/across/upon something

phrasal verb
to find or discover something by chance and unexpectedly [= come across]:
Researchers have stumbled across a drug that may help patients with Parkinson's disease.

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