Longman Dictionary of Contemporary English homepage

waterline

 noun
     
wa‧ter‧line
1

the waterline

TTW the level that water reaches on the side of a ship etc:
Two torpedoes struck below the waterline.
2 [singular] the edge of a large area of water, especially the sea, where it joins the land:
As the waterline advanced, the vegetation was swamped.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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