Third person singular present of thunder; to make a loud, deep, resonant sound like thunder, or to speak in a loud, forceful manner expressing anger or authority.
From Old English thunor, related to Germanic and Norse words for the god of thunder (Thor). The verb form developed from the noun, as the sound became associated with powerful, booming speech.
Thunder was so important to ancient cultures that Thursday (Thor's day) is named after the Norse thunder god! The verb 'thunder' captures how we've always associated loud, authoritative speech with divine or natural power.
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