To feel excruciating pain or anguish, as if ten thousand arrows are piercing one's heart; to be deeply heartbroken.
听到那个不幸的消息后，她感到万箭攒心，久久不能平静。
After hearing the unfortunate news, she felt excruciating pain as if ten thousand arrows were piercing her heart, and she couldn't calm down for a long time.
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