waterline

waterline
noun
  1. the level normally reached by the water on the side of a ship
    (船的)吃水线
    ■the level reached by the sea or a river visible as a line on a rock face, beach, or riverbank
    水位;海岸线
    ■any of various structural lines of a ship, parallel with the surface of the water, representing the contour of the hull at various heights above the keel
    (船的)水平线
  2. a linear watermark in paper
    (纸张上的)水印
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