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lubber linealso lub·ber's line (lŭb′ərz)
A line or mark on a compass that is aligned with the central axis of a moving body, especially a ship or aircraft, and represents the heading.
(or lub′ber) line`,
a reference mark on a compass or other navigational instrument indicating the heading of a vessel.
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|Noun||1.||lubber's line - a fixed line on a ship's compass indicating its heading|