lubber line

noun

1. a mark on a ship's compass that designates the fore-and-aft axis of the vessel Also calledlubber's line

Example Sentences

While he had winked his eyes, so it seemed to him, the true course had fairly straddled away from the lubber line.

From Project Gutenberg

Now go to your compass and see that its lubber line is exactly fore and aft and in the keel line of the ship.

From Project Gutenberg