Something or someone that crunches; a device or tool that crushes something with a crunching sound.
From 'crunch' (onomatopoetic verb) plus the agent suffix '-er,' following the standard English pattern of creating nouns for things that perform actions.
A cruncher can be literally anyone or anything—your teeth are crunchers, a cereal is a cruncher, a machine is a cruncher—English lets one simple agent noun describe an infinite variety of actions.
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