This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
媬 combines 女 (woman) with 保 (protect, keep). The exact historical development is uncertain, but it likely relates to a woman who protects or cares for someone.
A woman 女 standing beside 保 (protect) suggests a guardian or caretaker, but the exact meaning is unclear.
For ホ, imagine a woman protecting a sacred hoe (ホ) used in a ritual: hoe -> ホ, and the woman guards it carefully.
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