九きゅう段だん線せんMeanings1nounnine-dash line; nine-dotted lineRefers to the demarcation line used by China to claim territory in the South China Sea. A specialized geopolitical term.九きゅう段だん線せんは南みなみシナ海かいにおける中ちゅう国ごくの領りょう有ゆう権けん主しゅ張ちょうの境きょう界かい線せんである。The nine-dash line is the boundary line of China's territorial claims in the South China Sea.