This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 矪 is uncertain. It visually combines 矢 (arrow) and 舟 (boat), but the original meaning and component function are unclear.
With no clear meaning, picture an arrow (矢) beside a boat (舟) as a mysterious symbol whose purpose is lost.
For チュウ, imagine a crew (sounds like チュウ) of archers on a boat, but the kanji's meaning remains unknown.