the waterline
Definition of the waterline
: the level that water reaches on the side of a ship We repaired the hull below the waterline.
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waterlineplay
: a line that marks the level of the surface of water on something: such as
: the point on the hull of a ship or boat to which the water rises
: 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
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