The origin of the idiom "cup of joe" is believed to date back to the early 20th century, possibly during World War I or World War II. It's thought to be a reference to coffee, with "joe" being a common nickname for an average or generic person, similar to "John Doe." The use of "joe" in this context might have been a way to emphasize the ubiquity and everyday nature of coffee, which is a popular and essential beverage. Over time, the term "cup of joe" became a colloquial expression for an actual cup of coffee.

英語での「cup of joe」の定義と意味

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