This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 闦 is uncertain. It visually combines 門 (gate) with 豊, but the origin and original meaning are unclear.
With no clear meaning, picture a mysterious gate 門 with an ornate inner decoration 豊, guarding an unknown idea.
For ゴン, imagine a deep gong sounding as the gate opens: gong -> ゴン, echoing through the mysterious 闦.
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