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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), )
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1. jargon To process, usually in a time-consuming or
complicated way. Connotes an essentially trivial operation
that is nonetheless painful to perform. The pain may be due
to the triviality's being embedded in a loop from 1 to
1,000,000,000. "Fortran programs do mostly numbercrunching."
2. compression To reduce the size of a file without losing
information by a complicated scheme that produces bit
configurations completely unrelated to the original data, such
as by a Huffman code. Since such compression usually
takes more computations than simpler methods such as
run-length encoding, the term is doubly appropriate. (This
meaning is usually used in the construction "file crunching"
to distinguish it from number crunching.) Use of crunch
itself in this sense is rare among Unix hackers.
3. The hash character. Used at XEROX and CMU, among
other places.
4. To squeeze program source to the minimum size that will
still compile or execute. The term came from a BBCMicrocomputer program that crunched BBC BASIC source in
order to make it run more quickly (apart from storing
keywords as byte codes, the language was wholly interpreted,
so the number of characters mattered). Obfuscated C Contest
entries are often crunched; see the first example under that