This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
畼 combines 田 (field) with 昜, which likely contributes a phonetic element. The exact historical development is uncertain, and the character is rare in modern use.
The kanji has 田 (rice field) on the left and 昜 on the right. Without a clear meaning, picture an open field stretching out under the sun (日 in 昜), suggesting something expansive or growing.
For チョウ, imagine a long, stretching field where a chief named Chou oversees the land: Chou -> チョウ, and the field extends far.