up- + thunder
upthunder (third-person singular simple present upthunders, present participle upthundering, simple past and past participle upthundered)
- (poetic, archaic) To send up a noise like thunder.
- Samuel Taylor Coleridge, Ode on the Departing Year
- Strange-eyed Destruction! who with many a dream
Of central fires through nether seas — upthundering
Soothes her fierce solitude.