A person or animal that makes a continuous shaking or vibrating motion, or something that causes trembling.
From Middle English 'dridde' (to tremble or shake), likely of Germanic origin related to Old English 'dredan' (to dread). The suffix '-er' indicates an agent or thing that performs the action.
This word shows how fear-related words can shift meaning over time—'dridder' came from words about dread and trembling, but evolved to describe the physical motion itself rather than the emotion causing it.
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