A line marked or snapped using chalk, especially a string coated with chalk powder that carpenters and builders use to mark straight lines on surfaces.
From 'chalk' + 'line' (a mark or boundary), referring to the carpenter's tool that makes chalk-covered lines visible for construction accuracy.
The chalk line tool is such an elegant solution to a practical problem—by coating a string with chalk dust and snapping it, workers create perfectly straight marks over long distances, a technique used for centuries.
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