To increase in size or volume, or to rise and roll like big waves in the ocean.
From Old English 'swellan,' related to Germanic languages, originally describing the physical act of something expanding or puffing up due to liquid, air, or emotion.
Ocean swells can travel thousands of miles from distant storms without losing much energy—surfers in California ride waves created by typhoons near Japan, making swells nature's long-distance message bottles carrying energy across entire oceans!
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