"on good authority" in German on good authority aus guter Quelle Detailed translations for "on good authority" on good authority on good authority aus guter Quelle - One can speculate. But I have it on good authority that it was set to vibrate. Source: opensubtitles.org Corpus by OPUS Request review man kann spekulieren aber ich habe es aus guter Quelle es war auf Vibration gestellt.