To be deeply worried or anxious about something.
忡忡忧虑不安的样子。形容心事重重，非常忧愁。
《诗经·召南·草虫》未见君子，忧心忡忡。”
She was忧心忡忡 about her son's health.
Learn the next connected idiom: 忧心忡忡 (yōu xīn chōng chōng) → 重蹈覆辙 (chóng dǎo fù zhé)
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