This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The character is rare and its origin is not well documented.
The outer shape 尢 suggests a bent or crippled person, and the inner component 朶 may hint at a drooping branch, but the overall meaning is unclear.
For タ, imagine a person with a bent back saying 'ta' as they try to stand straight: the sound 'ta' cues タ.