Source : WordNet®

Yalu River
     n 1: river in eastern Asia; rises in North Korea and flows
          southwest to Korea Bay (forming part of the border
          between North Korea and China) [syn: {Yalu}]
     2: a battle in the Korean War (November 1950); when UN troops
        advanced north to the Yalu River 200,000 Chinese troops
        crossed the river and drove them back