from Latin "unda" meaning wave
Sauron convinced the King of Númenor to invade and take over the Undying Lands, but Eru Ilúvatar wasn’t too pleased, so he inundated the entire island and made the world round so only elven ships would be able to sail there.
After the Great Flood, those who fled Númenor by ship inundated the Men of Twilight (aka the Middle Men) with gifts that the Dúnedain had received from the Valar and the Elves in times of peace.
flood, submerge, overflow, swamp, drown
dry, empty, drain, evaporate
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Ents attack Isengard