This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 偧 is uncertain. It visually combines 亻 (person) with 奓, but the origin and original meaning are unclear.
A person 亻 beside 奓 (a shape with 夕 and 大) might suggest a person stretching or extending, but the meaning is uncertain.
For タ, imagine a person stretching a tarpaulin: tar -> タ, though the meaning is unclear.