おおう
to cover, to hide
A lid comes over the top and now you cannot see anything that is under it. Oh おお, oh う, the entire sky has gone that way: おおう.
隠す かくす is hiding a thing so that it will not be found. 覆う is putting something over the top of it.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.