cause célèbre UK /ˈkɔːz sɛˈlɛbɹ(ə)/US /ˈkɔz səˈlɛb/ noun1 •An issue or incident (originally, a legal case) arousing widespread controversy or public debate.Getting iced out by the tech giants turned Parler into a cause célèbre for conservatives who complained they were being censored, as well as a test case for the openness of the internet. — 2021 formscause celebres · causes célèbres