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EXCH

EXCH: /eks'ch*/ or /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).