ジークフリート線せんMeanings1nounSiegfried Linehistorical termHistorical term for the German defensive line built in the late 1930s, opposite the French Maginot Line.ジークフリート線せんは、第だい二に次じ世せ界かい大たい戦せん前まえにドイツが建けん設せつした防ぼう衛えい線せんです。The Siegfried Line was a defensive line built by Germany before World War II.