noun, masculine/ˌkul ˌde ˈsak/plural: cul-de-sacs
cul-de-sac; blind alley (street that leads nowhere); cul-de-sac (circular area at the end of a dead end street); cul-de-sac; dead end; impasse
From French cul-de-sac, from cul (“bottom”) + de (“of”) + sac (“bag, sack”).