Etymology
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earthquake (n.)

"movement or vibration of a part of the earth's crust," late 13c., eorthequakynge, from earth + quake (n.). In this sense Old English had eorðdyn, eorðhrernes, eorðbeofung, eorðstyrung.

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Definitions of earthquake

earthquake (n.)
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity;
Synonyms: quake / temblor / seism
earthquake (n.)
a disturbance that is extremely disruptive;
selling the company caused an earthquake among the employees
From wordnet.princeton.edu