全军覆没 complete annihilation
Explanation
指军队全部被消灭，也比喻事情彻底失败。
refers to the complete annihilation of an army; it is also used to express that something has completely failed.
Origin Story
话说三国时期，蜀汉丞相诸葛亮率领大军北伐曹魏，意图一举收复中原。然而，魏军实力雄厚，凭借着地利人和，屡屡挫败蜀军的进攻。诸葛亮经过多次的精心谋划和部署，却始终无法攻破魏军的防线，反而在一次关键战役中遭遇了重大挫折。魏军大将司马懿亲自率领精兵强将，对蜀军发起猛烈的反击，蜀军将士在魏军的强大攻势下，节节败退，最终全军覆没，诸葛亮无奈之下只得退兵。这次惨败，不仅使蜀汉元气大伤，也直接导致了诸葛亮不久后的去世，北伐计划就此终结。
During the Three Kingdoms period, Zhuge Liang, the prime minister of Shu Han, led a large army on a northern expedition against Cao Wei, aiming to reclaim central China. However, the Wei army was powerful, and with the advantages of geography and people, they repeatedly thwarted the Shu army's attacks. Despite Zhuge Liang's meticulous planning and deployment, he was unable to break through the Wei army's defenses and suffered a major setback in a crucial battle. Sima Yi, the Wei general, personally led elite troops in a fierce counterattack. Under the Wei army's powerful offensive, the Shu soldiers retreated steadily, ultimately resulting in their complete annihilation. Zhuge Liang was forced to withdraw his troops. This devastating defeat not only severely weakened Shu Han but also directly led to Zhuge Liang's death shortly afterward, ending the northern expedition plan.
Usage
作谓语、定语；形容军队全部覆灭或事情彻底失败。
Used as predicate or attributive; describes the complete annihilation of an army or the complete failure of something.
Examples
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经过这次失败的项目，我们团队可以说是全军覆没了。
jīngguò zhè cì shībài de xiàngmù, wǒmen tuánduì kěyǐ shuō shì quánjūn fùmò le
After this failed project, our team was completely wiped out.
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面对强敌，他们的军队全军覆没，再也没有力量反击。
miàn duì qiángdí, tāmen de jūnduì quánjūn fùmò, zài yě méiyǒu lìliang fǎnjī
Facing a strong enemy, their army was completely annihilated and had no strength to fight back.