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Transport of or relating to a train or trains to a more important place or one regarded as higher
Fully in operation.
In flat-bed terminology, indicating one or more documents being in position to photograph, for example, two up.
Working, in order. E.g. "The down escalator is up."
up(1) A device that is currently working.
(2) (uP) (microProcessor) uP is an alternate spelling for µP. Micro comes from the Greek mikros, which means "small," and the symbol is µ. See microprocessor.