sacrifice
禖 centers on a ritual offering to a deity: a sacrifice. The meaning is narrow and specific to religious ceremonies.
禖 combines 示 (altar, deity) with 某, which likely contributes the sound. The character is associated with a specific type of ancient sacrifice.
The left side 示 represents an altar or deity. The right side 某 looks like a container or offering. Picture placing a sacrifice on the altar.
For バイ, imagine buying a sacrifice to offer at the altar: buy -> バイ.
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