what does u mean in german
Answered by The Community. Making the world better, one answer at a time. The U stands for untersee (German for undersea, meaning underwater), as it was a submarine. The U-boat was the Unterseeboot (as in Das Boot), and in English is used to mean German submarines of World Wars I and II.t is a translation of German U-Boot which is short for Unterseeboot. A U-Boat is the English expression for the Germ â¦ an U-Boot (these languages are related historically-this explains the boat and boot - meaning the same).