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English definition of “Plimsoll line”

Plimsoll line

noun [C usually singular]     /ˈplɪm.sɒlˌlaɪn/ US  /ˈplɪm.sɑːlˌlaɪn/ (also Plimsoll mark)
a line painted on the outside of a ship that shows how deep it is legally allowed to go down into the water when it is fullParts of ships and boats
(Definition of Plimsoll line noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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