To feel completely at ease; to have one's mind completely set at rest; to be free from worry or anxiety.
听到这个好消息，她心中的石头终于落了地，整个人都丢心落肠了
Upon hearing the good news, the stone in her heart finally fell, and she felt completely at ease.
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To feel completely at ease; to have one's mind completely set at rest; to be free from worry or anxiety.