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Related to stumble on: stumble through
stumble on someone or something
1. Go to stumble across someone or something.
2. to trip over someone or something. There were three of us sleeping in the small tent. Each of us would stumble on the others whenever we went out or came in. I stumbled on the curb and twisted my ankle.
stumble onor stumble upon
1. To trip and almost fall on account of hitting the foot or stepping on something: He stumbled on the curb and fell. She stumbled upon a tree root.
2. To come upon something accidentally or unexpectedly: I happened to stumble on my jacket when I wasn't even looking for it. The detective stumbled upon the truth while thinking about something else.