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overflow bit

overflow bit: n. 1. [techspeak] A flag on some processors
   indicating an attempt to calculate a result too large for a
   register to hold.  2. More generally, an indication of any kind of
   capacity overload condition.  "Well, the Ada description was
   baroque all right, but I could hack it OK until they got to
   the exception handling ... that set my overflow bit."  3. The
   hypothetical bit that will be set if a hacker doesn't get to make a
   trip to the Room of Porcelain Fixtures: "I'd better process an
   internal interrupt before the overflow bit gets set".