luck of the devil
Also, luck of the Irish. Extraordinarily good fortune, as in You've the luck of the devil—that ball landed just on the line, or Winning the lottery—that's the luck of the Irish. These superstitious attributions of good fortune date from the first half of the 1900s.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.