Tsushima /tsuːʃiːmə/ noun2 •An island of Nagasaki, Japan, between the Home Islands and Korea, now divided by early modern canals. •A strait in Japan, between Tsushima Island and the Home Islands, the location of a major 1905 battle in the Russo-Japanese War.In 1905, the Russo-Japanese war fought itself to a standstill, and with the destruction of Rozhiestvensky's fleet at Tsushima, the Japanese, for financial reasons, had to put out feelers for peace. — 1952