This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
劺 combines 牟 and 力. The exact historical development is uncertain, but it likely follows a phono-semantic pattern where 力 contributes a meaning related to effort or strength.
With no clear meaning, picture the left side 牟 as a cow and the right side 力 as strength: a cow pulling with great effort, but the result is uncertain.
For ボウ, imagine a bow (as in bow and arrow) being drawn with great effort: bow -> ボウ, and the strength 力 is needed to pull it.