(G. Vasanthi, Chennai)
When you stumble over something or someone, you trip over the object or person. You lose your balance; you may or may not end up falling.
At the party, Harish stumbled over the chair and fell into the swimming pool.
There are several people sleeping in the drawing room. Don't stumble over any of them.
The expression ‘stumble on' can also be used to mean to trip over someone or something.
Gayathri stumbled on the step and hurt herself quite badly.
When we find something quite accidentally, we can say, we stumbled on/upon it. The expression can be used with people as well.
The children were looking for the ball when they stumbled on the cute puppy.
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