This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
撘 combines 扌 (hand) with 答, but the exact historical development and original meaning are uncertain.
The hand radical 扌 beside 答 (answer) suggests a hand giving an answer, but the kanji's meaning is unclear.
For トウ, imagine a hand (扌) answering (答) a question by pointing to a tall tower: tower -> トウ.
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