French triangle

English Noun A love triangle; a ménage à trois. en 1 May 1897 The Theatre 299 It is another play of the “French triangle” type, but sordid in incident and unrelieved by gleams of wit or humour. 205 You have brought us all this way to show us a French triangle. en 1963 Orient 5 74 The new French triangle—you might as well get used to it because you are going to see a lot of it—is husband, wife, and car.