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Hereupon means “at this moment” or “right after this.” Something has just happened or just been said, and the next thing follows on from it. It is story-book and legal English, not café English. Older tales use it the way we now use then or at that: the king spoke, and hereupon the hall went quiet. In papers it can mean “on this matter, after this.” Before the 1600s people often wrote it as two words, here upon; now it is one word. It feels old-fashioned. In ordinary talk, say then, after that, or at this.
於是、隨即（書面、故事體；日常說「接著」）
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
hereuponadv
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Immediately afterwards; at this.
- Laſtly, One way more there may be of miſtake, at that not unuſuall among us, grounded upon a double compute of the year; the one beginning from the 25 of March, the other from the day of our birth unto the ſame again, which is the naturall account. Now hereupon many men frequently miſcaſt their daies; for in their age they diduce the account not from the day of their birth, but the year of our Lord, wherein they were born.
- Again, be it that some nocive or hurtful thing be towards us, must Fear of necessity follow hereupon?
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。