Give some stream of consciousness and then the answer. A dead end is a street with only one inlet / outlet. A dead end is also known as a cul-de-sac (/ ˈkʌldəsæk / or / ˈkʊldəsæk /, from French for cul ( "bottom") + de ("of") + sac ("bag, sack") ) or no exit road in certain contexts and dialects.

Based on this passage, where does the term cul de sac come from?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The relevant sentence in the passage is: A dead end is also known as a cul-de-sac (/ ˈkʌldəsæk / or / ˈkʊldəsæk /, from French for cul ( "bottom") + de ("of") + sac ("bag, sack") ) or no exit road in certain contexts and dialects.
Therefore, the answer is from French for cul ( `` bottom '' ) + de ( `` of '' ) + sac ( `` bag , sack '' ).