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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.
Barry had joined the army immediately upon leaving school.
Upon his release, Davis went immediately to his mother’s.
Christmas is almost upon us again.
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 British English definition of upon. View American English definition of upon.