Dutchman's log
Americannoun
Nautical.
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a method of gauging a ship's speed, in which the distance between two shipboard observation stations is divided by the time elapsing between the throwing overboard of an object by the first station and the sighting of it by the second.
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.