The edge where land meets water, like where the ocean meets the beach or where a lake meets the land.
A compound word made from 'shore' (Old English 'scora,' meaning coast) combined with 'line,' literally the line where the shore is.
Shorelines are constantly changing—sand moves, rocks erode, and water levels shift, so the exact 'line' is never really fixed, making it philosophically tricky to legally define.
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