earth-shatteringEnglishOxford New American Dictionaryearth-shattering /ˈərTHˌSHadəriNG, ˈərθˌʃædərɪŋ / (also earth-shaking) ▸ adjective (in hyperbolic use) very important, momentous, or traumatic: tell me this earth-shattering news of yours. – DERIVATIVES earth-shatteringly (also earth-shakingly) adverb