i Register
In some senses, u-boat is marked as slang, historical. Watch for register when choosing this word.
u-boat
noun 3
Definitions
noun
1
Any German submarine of the First or Second World War, or any Austro-Hungarian submarine of the First World War.
2
A narrow utility cart with tall handles on both ends that is used to carry loads of retail products to be sold, so named because its shape is roughly that of a capital U.
3
Nickname given to the General Electric Universal Series diesel-electric locomotives.
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