Would anyone know what "High-order overflow" means?

Are you talking about assembly? Because there would be High order bits & Low order bits. If it is, then you should know what "overflow" means. If you attempt to assign values that is above the capacity of the bits can take, it could cause unexpected result or break your program (somewhat similar to buffer overflow).

Coming to think of it, that could be what it refers to. High order bit overflow. Makes sense.

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