Definitions from Wiktionary ( )

▸ verb:  To crush something, especially food, with a noisy crackling sound.
▸ verb:  To be crushed with a noisy crackling sound.
▸ verb:  (slang) To calculate or otherwise process (e.g. to crunch numbers: to perform mathematical calculations). Presumably from the sound made by mechanical calculators.
▸ verb:  To grind or press with violence and noise.
▸ verb:  To emit a grinding or crunching noise.
▸ verb:  (automotive, transitive) To cause the gears to emit a crunching sound by releasing the clutch before the gears are properly synchronised.
▸ verb:  (computing, transitive) To compress (data) using a particular algorithm, so that it can be restored by decrunching.
▸ verb:  (software engineering, slang, transitive) To make employees work overtime in order to meet a deadline in the development of a project.
▸ noun:  A noisy crackling sound; the sound usually associated with crunching.
▸ noun:  A critical moment or event.
▸ noun:  A problem that leads to a crisis.
▸ noun:  (exercise) A form of abdominal exercise, based on a sit-up but in which the lower back remains in contact with the floor.
▸ noun:  (software engineering, slang) The overtime work required to catch up and finish a project, usually in the final weeks of development before release.
▸ noun:  A dessert consisting of a crunchy topping with fruit underneath.
▸ noun:  (chiefly US) The symbol #.
▸ noun:  (cooking, generally in the plural) A small piece created by crushing; a piece of material with a friable or crunchy texture.
▸ noun:  (slang) A shortage.

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