怨
yuàn · HSK 5
to blame
夗 (phonetic yuàn) + 心 (heart) = a grudge held in the heart
心 at the bottom marks 怨 as a heart-emotion: resentment, complaint, holding someone to blame. The top 夗 carries the yuàn sound. Shares its 夗 phonetic with 鴛 (yuān, mandarin duck).
怨 — 夗 (phonetic) + 心 (heart)
A semantic-phonetic compound: the heart radical 心 supplies the meaning (an emotion) while 夗 gives the sound. The original sense was a deep grudge or resentment held in the heart, and the modern meanings 'to resent, blame, complain' all extend from that core feeling.