To vow to defy, even at the cost of one's life; to refuse to yield to the death.
即使受到巨大的压力，他依然誓死不从，拒绝改变自己的原则。
Even under immense pressure, he still vowed to defy, refusing to change his principles.
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To vow to defy, even at the cost of one's life; to refuse to yield to the death.