What do a.m. and p.m. stand for?

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.
Origin of margin line
1840-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for margin line
  • 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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