U-boat | a German submarine |
ultimatum | a final offer issued in negotiations, the rejection of which can lead to a break in relations and some action |
undercarriage | the part of a plane, including the wheels, that provides support when it is on the ground and when it is landing or taking off |
unexploded ordnance | any sort of military ammunition or explosive ordnance that has failed to function as intended |
United Kingdom (UK) | refers to the United Kingdom of Great Britain and Ireland from 1 January 1801 to 5 December 1922, or the United Kingdom of Great Britain and Northern Ireland from 5 December 1922 |
upper class | describes a group of people in a society who have the highest economic or social status |
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