iron duke n.[rhy. sl. = fluke n.2 (1); the orig. Iron Duke was the Duke of Wellington (1769–1852)]a lucky chance.Show quotations1960J. Franklyn Dict. of Rhy. Sl. 1984Partridge DSUE (8th edn) 601: late 19C–20. 1992R. Puxley Cockney Rabbit.
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