Definitions for "Single Hung Window"
Keywords:  sash, hung, sliding, slider, window
A window that has one sash or glass panel that moves up and down, while the other sash is fixed is called a single hung window. Usually the top glass panel is fixed.
A HUNG WINDOW WHO'S UPPER SASH IS EITHER AN INTEGRAL PART OF THE FRAME OR AN OTHERWISE IMMOBILIZED SEPARATE SASH AND HAS A BOTTOM SASH WHICH CAN BE RAISED AND LOWERED AND ALSO TILTED IN.
This style of vertical sliding panel window is constructed of two panels, only one of which moves. See Double Hung Window.