cul-de-sac
noun (from French)a street that is closed at one end 死胡同;死巷 We live in a quiet cul-de-sac. 我们住在一个安静的死胡同里。 - (figurative)
This particular brand of socialism had entered a cul-de-sac (= could make no further progress). 这种特殊的社会主义已经走进了死胡同。
Word Originmid 18th cent. (originally in anatomy): French, literally ‘bottom of a sack’.