Plural of hairbrush; multiple tools with bristles used for grooming, styling, or detangling hair.
Compound of 'hair' (Old English 'hǽr') and 'brush' (possibly from Old French 'brosse'). The compound formed naturally as people needed a specific name for this grooming tool.
The humble hairbrush shows how tool design shapes language—we don't say 'brush for hair,' we compound it into one word because it's such a specific, common thing.
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