shame
怩 centers on the feeling of shame or embarrassment, often from a personal failing or exposure.
怩 combines the heart radical 忄 with 尼, which likely provides the sound. The exact historical development is uncertain, but the heart component suggests an emotional state like shame.
The heart radical 忄 next to 尼 suggests a heart weighed down by shame, as if a nun (尼) is feeling embarrassed.
For ジ, imagine a person feeling shame when they mispronounce 'G' as 'ジ' in front of a nun: the 'G' sound cues ジ, and the embarrassment ties to the meaning.
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