To overflow or flood; to surge forth in waves or torrents.
From Latin exundatus, derived from exundare (to overflow), combining ex- (out) and undare (to wave). This verb describes the action of water overflowing its boundaries.
The root word 'undare' means 'to wave' — so to exundate is literally to wave/surge outward uncontrollably, a poetic way to describe flooding that emphasizes the wave-like motion of overwhelming water.
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