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To begin your search, go to the alphabetical index below and click on the first letter of the word you are searching for.

upon, up on, on

Most authorities agree that the prepositions on and upon are generally interchangeable. The choice depends on rhythm, emphasis or convention; upon is slightly more formal or poetic.

  • I heard your favourite author on the radio last week.
  • Paula carefully placed the book on (or upon) the desk.
  • When Jacques Cartier first set eyes upon (or on) the St. Lawrence River, he thought he had found the Northwest Passage.
  • Gilles set one brick upon (or on) the other, until the makeshift tower tipped over and crashed.
  • Many traditional stories begin, "Once upon a time …"

When referring to something in a high place or when using on after a phrasal verb ending in up (e.g., follow up), use the two-word spelling up on (not upon).

  • Heather lives high up on Hamilton Mountain.
  • Please follow up on the request from Saskatoon.