Select the most appropriate meaning of the given idiom. A sea change

The most appropriate meaning of the idiom "a sea change" is complete transformation.

The other options are incorrect.

• "Going on a trip abroad" does not mean a complete transformation. Going on a trip abroad is about experiencing a new culture and seeing new things.
• "Getting transferred overseas" does not mean a complete transformation. Getting transferred overseas is about moving to a new country and starting a new job.
• "Health-related vacation" does not mean a complete transformation. A health-related vacation is about taking time off to improve one's health.

The idiom "a sea change" comes from the idea of the ocean changing from one state to another. In the same way, a sea change means a complete transformation, especially in one's outlook or attitude. For example, you might say that a person had a sea change after they went through a difficult experience.