‖advocatus diaboli|ædvəʊˈkeɪtəsdaɪˈæbəlaɪ|[mod.L.;cf.advocaten.]‘Devil's advocate’ (Deviln.25 b).1842H. C. RobinsonLet.29 Dec. (1927) I. 473You are aware that here I am considered as a sort of Advocatus Diaboli.1883Guardian 21 Mar. 412/1The mere advocatus diaboli who is content to damage an opponent.1929Music &Lett.X. 194It is a pleasant thing to play advocatus diaboli with the knowledge that one is going to allow oneself to cross over to the angels' bench later.