This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 愗 is uncertain. It visually combines 敄 (top) and 心 (bottom), but the original semantic and phonetic roles are unclear.
With 心 (heart) at the bottom and a complex top, 愗 might suggest a troubled or foolish heart, but its meaning is not reliably known.
For ボウ, imagine a bow (ボウ) tied around the heart (心) at the bottom, as if restraining a confused mind.