up

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Related to up against: come up against, up against the wall

up

Transport of or relating to a train or trains to a more important place or one regarded as higher
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

up

[əp]
(engineering)
Fully in operation.
(graphic arts)
In flat-bed terminology, indicating one or more documents being in position to photograph, for example, two up.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

up

(jargon)
Working, in order. E.g. "The down escalator is up."

Opposite: down.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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.
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