This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
謜 combines 言 (speech) with 原, which likely contributes the sound. The exact historical development and original meaning are uncertain.
With 言 (speech) beside 原 (origin), imagine words flowing from a spring, but the exact meaning remains unclear.
For ゲン, picture a genie (ゲン) emerging from the original spring (原) to speak (言) mysterious words.
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