grieve, sorrowful
怊 centers on deep emotional pain: grieving or feeling sorrowful. The two given meanings are close synonyms describing a state of sadness.
怊 combines the heart radical 忄 with 召, which likely contributes the sound. The heart radical indicates an emotion, fitting the meaning of grief or sorrow.
The heart radical 忄 beside 召 suggests a heart that is summoned into sorrow. Picture your heart being called to grieve.
For チョウ, imagine a grieving person named Chou, whose heart is heavy with sorrow: Chou -> チョウ, and the heart radical 忄 shows the emotion.