EXCH

from Jargon File (4.4.4, 14 Aug 2003)
EXCH
 /eks'ch@/, /eksch/, vt.

   To exchange two things, each for the other; to swap places. If you
   point to two people sitting down and say "Exch!", you are asking them
   to trade places. EXCH, meaning EXCHange, was originally the name of a
   PDP-10 instruction that exchanged the contents of a register and a
   memory location. Many newer hackers are probably thinking instead of
   the {PostScript} exchange operator (which is usually written in
   lowercase).
    
from The Free On-line Dictionary of Computing (8 July 2008)
EXCH

   <jargon> /eks'ch*/ or /eksch/ To exchange two things, each for
   the other; to swap places.  If you point to two people sitting
   down and say "Exch!", you are asking them to trade places.
   EXCH, meaning EXCHange, was originally the name of a {PDP-10}
   instruction that exchanged the contents of a {register} and a
   memory location.

   Many newer hackers are probably thinking instead of the
   {PostScript} exchange operator (which is usually written in
   lowercase).

   [{Jargon File}]

   (1999-09-17)
    

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