This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
偒 combines the person radical 亻 with 昜, but the exact historical development and original meaning are uncertain.
A person 亻 beside 昜, but the meaning is unclear. Think of it as a person standing in bright sunlight, perhaps representing an obscure concept.
For トウ, imagine a person 亻 standing under the sun 昜, feeling the heat and saying 'toe' (トウ) as they wiggle their toes in the warmth.