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chance (up)on someone or something
to find someone or something by accident; to happen on someone or something. (Upon is formal and less commonly used than on.) I chanced upon a nice little restaurant on my walk today. I chanced on an old friend of yours in town today.
Also, chance upon. Happen upon, find or meet accidentally, as in In Paris we chanced on a wonderful little restaurant, or Andrew chanced upon his karate teacher in the health-food store. [Mid-1500s]
chance onor upon
To find or meet someone or something accidentally; happen upon someone or something: While in Atlanta we chanced on two old friends. I chanced upon my neighbor while I was shopping at the mall.