margin line

noun Nautical.
1.
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.
2.
the line along which the planking on a transom-sterned vessel terminates aft.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
Use a margin-to-margin line across the page both preceding and following the equation to set it off from the text.
Main headings should be in all caps, underlined, and begin at the left margin line.
Write a description of the desired situation at the bottom of the left-hand margin line.
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