high
潼 centers on the idea of high, elevated, or lofty, often in a geographical or metaphorical sense.
潼 combines 氵 (water) with 童, which likely contributes the sound. The exact historical development is uncertain, but it may have originally referred to a high river or elevated water.
Water 氵 rising high like a child 童 standing on tiptoes: 潼 means high.
For ドウ, imagine a high mountain peak shaped like a doughnut: dough -> ドウ, and the peak is high.
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