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A police patrol happened upon a robbery in a bank yesterday.
They draw upon their experience to educate and guide new companies.
My whole future depended upon the decision of this one manager.
His first act upon taking office was to repeal the luxury tax.
Upon his release, Davis went immediately to his mother’s.
The fall TV season is upon us.
I’ve written to you, year upon year, and never heard from you.
We drove across mile upon mile of wide-open space.
This is the American English definition of upon. View British English definition of upon.