This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
譶 is a rare character composed of three 言 (speech) components. The exact historical development is uncertain, but it likely conveys an idea of rapid or overlapping speech.
Three mouths (言) stacked together suggest many voices talking at once, perhaps rapidly or chaotically.
For トウ, imagine a tower of three talking mouths all speaking at once: tower -> トウ.