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Cheerio is a British way of saying goodbye — friendly and informal, a bit like “bye!” with a small smile. An older British person might say it as they leave a shop or finish a phone call. Younger people in Britain use it much less now; it can sound old-fashioned, or like a joke copying an old film. Americans do not say cheerio to mean goodbye. Though actually, in older British speech it could also be a light hello, but the meaning you need here is goodbye. It has nothing to do with the breakfast cereal Cheerios, even though the names look almost the same.
再見（英式口語，偏老派）
原始詞典資料4 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。
Cheerionoun
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An individual piece of the Cheerios breakfast cereal.
- A single Cheerio fell off my spoon.
cheeriointj/ˈtʃɪəɹi.əʊ/
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informalGoodbye, an interjection said upon parting.
- "In that case," said Archie, relieved, "cheerio, good luck, pip-pip, toodle-oo, and good-bye-ee! I'll be shifting!"
- But we all knew it wasn't the final end of the HST. This wasn't "goodbye", more like a "cheerio, see you someplace soon".
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rareHello; a greeting.
- Cheerio, everybody! What a delightful gathering of charming femininity!
cheerionoun/ˈtʃɪəɹi.əʊ/
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A small saveloy often consumed with tomato sauce at parties.
- The man who has gone around the cocktail circuit pounding cheerios to the end of time did not come in here and open his mouth once on the Bill.
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。