This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
庱 combines 广 (building) with 夌, but the exact historical development and original meaning are uncertain.
The kanji has a building 广 enclosing 夌, but without a clear meaning, it is hard to form a reliable mnemonic. You might imagine a mysterious building with an unknown purpose.
For チョウ, picture a long-serving chief named Chou standing in front of the mysterious building: Chou -> チョウ.
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