One of the mysteries of the English language finally explained.
(A nickname for) the German Chancellor Otto von Bismarck (1815–98), with reference to his advocacy of military force as a tool of foreign policy.
Late 19th century; earliest use found in George Meredith (1828–1909), novelist and poet. From old + iron + -er.
Old Ironer/ˌəʊld ˈʌɪənə/
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