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 (/ kldsk / or / kldsk /, 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?
The relevant sentence in the passage is: A dead end is also known as a cul-de-sac (/ kldsk / or / kldsk /, 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 '' ).