: a line that marks the level of the surface of water on something: such as. a(1) : the point on the hull of a ship or boat to which the water rises. (2) : a line marked on the outside of a ship that corresponds with the water's surface when the ship is afloat on an even keel under specified conditions of loading.
Apr 12, 2024
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noun ... Also called watermark. a line indicating the former level or passage of water: A water line all around the cellar served as a reminder of the flood.