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.'
Every suburban cul-de-sac is literally named 'bag bottom' in French! Doctors first used this term for dead-end body parts like intestinal pouches, then city planners borrowed it because dead-end streets trap cars like the bottom of a closed bag traps objects.
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