'Yalu River' definitions:

Definition of 'Yalu River'

(from WordNet)
noun
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, Yalu River]
noun
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