proper noun/ɡʁɑ̃d nwaʁ.sœʁ/
Grande Noirceur (a period in the history of Quebec during the second Union Nationale government of Premier Maurice Duplessis between 1944 and 1959, marked by economic liberalism, union busting, and Roman Catholic Church control of provincial education, healthcare and social services)
Literally, “Great Darkness”, popularized by critics of the Union Nationale during the Quiet Revolution of the 1960s as a pejorative description of Quebec Premier Maurice Duplessis's second government.