margin line

noun Nautical.

an imaginary line used in making calculations regarding the flooding of hulls, running fore-and-aft 3 inches (8 cm) below the upper surface of the bulkhead deck at the side.
the line along which the planking on a transom-sterned vessel terminates aft.

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Origin of margin line

First recorded in 1840–50

Words nearby margin line

margherita, margie, margin, margin account, margin call, margin line, margin of safety, margin plank, marginal, marginal cost, marginal costing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020