This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
誻 combines 言 (speech) with 沓, which likely contributes the sound. The exact historical development is uncertain.
With 言 (speech) on the left and 沓 (a shape associated with overlapping or piling up) on the right, imagine words piling up in a confusing, overlapping argument.
For トウ, picture a tower of piled-up words: tower -> トウ, and the speech radical 言 is buried under the heap.