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Definition of U-boat noun from the Oxford Advanced Learner's Dictionary

U-boat

noun

/ˈjuː bəʊt/

/ˈjuː bəʊt/

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a German submarine (= a ship that can travel underwater)Topics Transport by waterc2
Word Originfrom German U-boot, abbreviation of Unterseeboot ‘undersea boat’.

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B2

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