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lubber's line

or lubber line

noun, Navigation.
a vertical line on the forward inner side of the bowl of a fixed compass, used as a reference mark indicating the heading of a vessel.
Also called lubber's mark, lubber's point.
Origin of lubber's line
First recorded in 1855-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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