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Related to tumble on: tumble dry
tumble on (something)
1. Literally, to trip on something with one's foot. I wasn't watching where I was going and tumbled on the root of a tree. The child tumbled on the steps of the house.
2. To find, discover, or happen upon something casually or by chance. I tumbled on this fantastic little café the other day. Let me know if you tumble on my keys—I haven't been able to find them.
tumble onor tumble upon
To come upon something accidentally; happen on something: We tumbled on a nice restaurant while walking downtown.