place name in Guangxi province
崠 is a rare kanji used as a place name in Guangxi province. Its standalone meaning is unclear outside of that geographic context.
崠 combines 山 (mountain) with 東, which may have contributed a phonetic element. The exact historical development is uncertain, and the character is primarily known as a place name.
A mountain 山 with 東 on the right, like a mountain in the east. This kanji is used for a specific place name, so picture a sign on a mountain labeled with 崠.
For トウ, imagine a tall mountain peak that looks like a toe: toe -> トウ, and the mountain 山 stands beside it.
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