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Origin of 24/7

Posted by ESC on April 04, 2001

In Reply to: Origin of 24/7 posted by R. Berg on April 04, 2001

: I have an idea that "24/7" (twenty-four seven), meaning "constantly" and now often heard in the United States, originated among African-American speakers. Can anyone confirm or disconfirm this?

I couldn't find it in any of my references.