Definition
(He smiled) upon seeing (the baby): (He smiled) when he saw (the baby); (He smiled) when (the baby) came into view
Upon + verb in ING is an expression which indicates one action immediately preceding or producing another. The verb in ING is a "gerund" in this expression, a verb acting as a noun.
- "Several people saw the troubling red color which appeared on my son's face upon eating his tuna steak, and I personally can confirm that he vomited no fewer than eighteen times when he returned home."
- "I am also filled with terror upon discovering your new president, but that is a discussion for another time!"
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