sea-change

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Английский Язык - Английский Язык
A profound transformation

Public opinion has undergone a sea change since the 2002 elections.

{i} substantial and notable transformation; noticeable change in appearance; (Nautical) transformation of a harbor or beach caused by the sea
A sea change in someone's attitudes or behaviour is a complete change. A sea change has taken place in young people's attitudes to their parents. a very big change in something sea change in
seachange
A significant change, one that alters the very nature of the subject