This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
噵 combines 道 (path, way) with 口 (mouth), but the exact historical development and original meaning are uncertain.
The top 道 suggests a path, and the bottom 口 suggests speaking. Imagine a spoken path or guidance, but remember the actual meaning is unclear.
For トウ, picture a toe pointing the way along a path: toe -> トウ, and the mouth 口 speaks directions.