| up in the air |
undecided, unsettled, or uncertain. |
| upkeep |
the maintenance required to keep something or someone in good condition. [2 definitions] |
| upland |
the elevated or higher parts of land in a region. [2 definitions] |
| uplift |
to improve the spiritual, moral, or social condition or mood of. [3 definitions] |
| upload |
to transfer (data, files, or programs) from one's own computer to another, often larger, computer or a network. [2 definitions] |
| upmost |
(informal) uppermost. |
| upon |
on. [4 definitions] |
| up one's sleeve |
held secretly or in reserve. |
| upper |
higher in place, rank, position, or level. [6 definitions] |
| Upper Carboniferous |
see "Pennsylvanian." |
| upper-case |
of printed letters, capital. [2 definitions] |
| upper case |
in printing, the tray containing the type for capital letters and special characters. |
| upper-class |
of, relating to, or belonging to a high social class. [2 definitions] |
| upper class |
the most prominent or richest group of people in a society. |
| upperclassman |
a member of the junior or senior class in a high school, college, or university. |
| upper crust |
(informal) the most prominent or richest group of people in a society; upper class. |
| uppercut |
a quick blow that is directed upward, usu. to an opponent's chin. [2 definitions] |
| upper hand |
a position of domination, control, or advantage. |
| upper house |
(often cap.) the smaller, less representative branch of a bicameral legislature, such as the U.S. Senate. |
| uppermost |
highest in place, rank, influence, or importance. [2 definitions] |
| Upper Volta |
see "Burkina Faso." |