Dark oily matter that accumulates on machinery, especially in train yards or industrial settings; machine grime.
French word derived from 'cambouise' (greasy soot), itself from Dutch 'kombuis' (kitchen/galley). The greasy byproduct of machinery maintenance became named after the greasy kitchen areas where such grime naturally accumulated.
French railroad workers had such specific vocabulary for industrial grime that they borrowed and adapted a ship kitchen word—showing how specialized communities develop incredibly precise languages for things they work with daily.
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