verb
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To crush something, especially food, with a noisy crackling sound.
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To be crushed with a noisy crackling sound.
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(slang) To calculate or otherwise process (e.g. to crunch numbers: to perform mathematical calculations). Presumably from the sound made by mechanical calculators.
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To grind or press with violence and noise.
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To emit a grinding or crunching noise.
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(automotive, transitive) To cause the gears to emit a crunching sound by releasing the clutch before the gears are properly synchronised.
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(computing, transitive) To compress (data) using a particular algorithm, so that it can be restored by decrunching.
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(software engineering, slang, transitive) To make employees work overtime in order to meet a deadline in the development of a project.