conj
whereupon
weh-uh-ruh-PON
conj
1
Immediately after which; as a result of which.
"He apologized, whereupon she finally smiled."
How to Use Whereupon
Learner’s notesIn plain EnglishA formal way of saying "after which" or "at which point."
When to use it
Mostly seen in formal or literary writing to link two events in sequence.
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He apologized, _____ she finally smiled.
Etymology
From Middle English wherupon, built from "where-" plus "upon."