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.

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Also called lubber's mark, lubber's point .

Origin of lubber's line

First recorded in 1855–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020