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Upondoingsomething

English Vocabulary tips & definition with Gymglish.
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Definition

(He smiled) upon seeing (the baby): (He smiled) when he saw (the baby); (He smiled) when (the baby) came into view
preposition
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.

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