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Synonyms

U-boat

American  
[yoo-boht] / ˈjuˌboʊt /

noun

  1. a German submarine.


U-boat British  

noun

  1. a German submarine, esp in World Wars I and II

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of U-boat

1910–15; < German U-Boot, short for Unterseeboot literally, undersea boat

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The first dog sled patrols began in eastern Greenland during World War II, when they discovered and helped destroy German weather stations, denying the Germans crucial information for their U-boat campaign in the Atlantic.

From Barron's • Jan. 28, 2026

For the most part, however, “Wolfpack” chronicles the misery, failure and deaths of U-boat crews.

From The Wall Street Journal • Nov. 7, 2025

But as happened elsewhere in the country, much of L.A.’s public German community went to ground after May 1915, when a German U-boat sank the British ocean liner Lusitania.

From Los Angeles Times • Aug. 8, 2025

That included staffing her post as the news came in that a convoy escorted by her future husband’s ship, the destroyer HMS Oribi, had been attacked by a U-boat wolf pack.

From Seattle Times • May 30, 2024

George Dasch and his team boarded a freighter, crossed its deck, and walked carefully over a gangplank into German U-boat 202.

From Nazi Saboteurs by Samantha Seiple

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