ground-breaking (adj.)youdaoicibaDictYouDict[ground-breaking 词源字典]
also groundbreaking, 1907 as a figurative adjective, from expression to break ground (1650s), either for planting or for building, which was in figurative use by 1884; see ground (n.) + break (v.).[ground-breaking etymology, ground-breaking origin, 英语词源]