Cul-de-sac

/ˈkʌldəsæk/ noun

A street or passage closed at one end; a dead-end road, typically with a circular area for turning around.

Pure French meaning 'bottom of the bag' - literally the closed end of a sack where nothing can get out. French anatomists used this term for body parts that were closed at one end, like certain intestinal pouches. English borrowed it for dead-end streets because they resembled the closed end of a bag where cars get 'trapped.'

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