to have a big change in perspective
to undergo a complete transformation
a striking change in appearance
There was a sea change in his personality after he married his wife.
“And that these hearings are the beginning of a real sea change in the relationship between the government and technology.”
We have just been bought over by a new company. It seems as if a sea change is in store for our marketing department.
Since she started working out there has been a sea change in her appearance.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.