This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
詓 combines 言 (speech) with 去, which likely contributes a phonetic element. The exact historical development is uncertain.
With 言 (words) and 去 (leave), imagine words that leave you uncertain—like a rare kanji with no clear meaning.
For キョ, imagine a key (キー) that opens a box of old words, but the key is slightly off: キョ. The words 言 and the leaving 去 hint at something lost.