Something that causes earthquakes or intense vibrations; in mythology, often an epithet for a god (like Poseidon).
Compound of 'earth' (Old English eorthe) and 'shaker' (Old English sceacan, from Proto-Germanic *skakanan, + agent suffix '-er'). Has roots in ancient mythology dating back to Homer.
In Greek mythology, Poseidon was called 'earth-shaker'—people thought gods literally made earthquakes, which shows how humans once imagined divine power as having the same destructive force as tectonic plates.
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