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1. National Missile Defence. A controversial plan to set up a series of interceptor systems to destroy incoming nuclear warheads and render an entire nation safe from missile attack. 2. A virulent curse in Mandarin Chinese, as coined by late Qing Dynasty and early Republic of China writer Lü Xun, who defined the "national curseword" of the Chinese people as "ni ma de", or literally "your mother's ...". Lü Xun never specified what possession or part of the mother is meant, but one can presume it is obscene. Compare this with TMD and WMD.
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