grieving
愽 centers on the feeling of grieving, a deep sorrow or mourning.
愽 combines 忄 (heart) with 尃, which likely contributes the sound. The exact historical development of 尃 is uncertain, but the character is associated with grieving or sorrow.
The heart radical 忄 beside 尃 suggests a heart weighed down by sorrow. Picture a heavy, spreading grief pressing on the heart.
For タン, imagine a tan-colored autumn leaf falling, symbolizing grief: tan -> タン, and the heart mourns the passing season.
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