锁国 (鎖國) suǒguó

1. suǒguó verb to close a country; to exclude foreign contact; closed country
   Domain: Modern Chinese 现代汉语
   Notes: Eg, Qing China, North Korea (CC-CEDICT '鎖國')
2. suǒguó proper noun Sakoku
   Domain: History 历史
   Notes: Japan's self-imposed isolation from 1603 to 1868 (Wikipedia '锁国 (日本)')

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闭关锁国