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I once stopped to think about exactly what I was saying, and, though I'd always known it didn't make sense, I realized I'd never questioned it before. Does it have its origin in a longer question that was cut short? Does it come from being concerned about a place or person that is literally higher than you? Or is it just an arbitrary preposition with no actual meaning and no real reason for being there?

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    Related: english.stackexchange.com/questions/22021/… – user66974 Dec 29 '16 at 20:01
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    Absolutely, this question is not a duplicate of the suggested question above. The title is misleading, the older question is asking why it is used as a form of greeting. – Mari-Lou A Dec 29 '16 at 20:30
  • Speculatively, even 1,000 years ago in any kind of formal meeting, say of a court or a company or a parish council, items ‘moved up’ the agenda until they 'came up' for discussion. Finished with an item, the chairman asked the secretary: ‘What’s up next?’ then in many another context, ‘next’ was lost. I agree with Mari-Lou… it's a different question that happens to be about the same phrase. – Robbie Goodwin Jan 12 '17 at 19:49

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