A "sea change" is a nautical reference going back to the days when sailors did not have elaborate navigational systems at their disposal and had to rely on the diligent monitoring of changes in wind patterns and velocity, the color of the sky, wave action, etc. to keep their ship from sinking.

Question

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The statement describes the origin and meaning of the phrase "sea change."

A "Sea Change" Is a Nautical Reference Going Back to the Days