This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
庨 combines 广 (building/eaves) with 孝 (filial piety). The exact historical development is uncertain, and the character is rare.
A building (广) containing filial piety (孝) might suggest a hall for ancestral rites, but the meaning is unclear.
For コウ, imagine a filial son (孝) bowing (コウ) under the eaves (广) of the family hall.
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