earthquake 
1. shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity (Freq. 17) • Syn: quake, temblor, seism • Derivationally related forms: seismic (for: seism), seismal (for: seism), quake (for: quake) • Hypernyms: geological phenomenon • Hyponyms: shock, seismic disturbance, tremor, earth tremor, microseism, seaquake, submarine earthquake 2. a disturbance that is extremely disruptive - selling the company caused an earthquake among the employees • Hypernyms: disturbance, disruption, commotion, flutter, hurly burly, to-do, hoo-ha, hoo-hah, kerfuffle
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