sea change

a striking change, as in appearance, often for the better.
any major transformation or alteration.
a transformation brought about by the sea.

1600–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sea change
a seemingly magical change, as brought about by the action of the sea
[coined by Shakespeare, in Ariel's song ``Full Fathom Five'' in The Tempest (1611)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The long-awaited sea change in higher education is upon us.
The problem with this is that the doctorate is generally an acculturation
  process, which requires a sea change in mindset.
Their report called for a sea change in the way that economists and politicians
  think about the benefits of economic growth.
It seems to me that that would require a sea change in the way doctors and
  patients relate.
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