A cul-de-sac (originally in anatomy: French, literally "bottom of a sack" or "bottom of bag") or dead-end street is a street with only one inlet/outlet. A cul-de-sac is usually differentiated by having a turnaround area at its closed end. Both cul-de-sac and dead end are also used metaphorically to mean a line of thought or action which leads nowhere.
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Cul de sac is a french expression !