This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 謋 is uncertain. It combines 言 (speech) with 桀, but the role of 桀 is unclear.
With 言 (speech) beside 桀, imagine a mysterious word that has lost its meaning over time, like a forgotten incantation.
For カク, picture a scholar trying to decipher the forgotten word, writing it on a card: card -> カク, but the meaning remains elusive.