入宋にっそうにっそうMeanings1nountravel to Song ChinaarchaicHistorical term for traveling to Song-dynasty China, mainly during the Heian and Kamakura periods. Archaic; used in historical contexts.平へい安あん時じ代だい、多おおくの僧そうが入宋にっそうして仏ぶっ教きょうを学まなんだ。