This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
悎 combines 忄 (heart/mind) with 告 (announce), but the exact historical development is uncertain.
The heart radical 忄 beside 告 suggests a feeling related to announcing or telling, but the exact meaning is unclear.
For コウ, imagine a heart 忄 that announces 告 a public 'ko' sound: コウ.