U-boat

Meaning

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. (slang) Nickname given to the General Electric Universal Series diesel-electric locomotives.

Synonyms

submarine

pigboat

sub

submersible warship

submerged craft

undersea boat

submersible

underwater craft

Etymology

Partial calque of German U-Boot.