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patch space: n. An unused block of bits left in a binary so that it can later be
modified by insertion of machine-language instructions there (typically,
the patch space is modified to contain new code, and the superseded code is
patched to contain a jump or call to the patch space). The near-universal
use of compilers and interpreters has made this term rare; it is now
primarily historical outside IBM shops. See patch
(sense 4), zap (sense 4),
hook.
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