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1.
A metaphor for a dramatic life or lifestyle change, as in sailing to a completely different sea.
I moved to the west coast and got a new job because I was in need of a sea change.
by NorCalFluke May 01, 2007
 
2.
sea change noun C LITERARY
a complete change:
There will have to be a sea change in people's attitudes if public transport is ever to replace the private car.

(from Cambridge Advanced L
by rick stark May 04, 2006