double-hung window; sash window
A window consisting of two vertically sliding sashes. The name comes from the guillotine-like vertical movement. Compare 上げ下げ窓, which is a more general term for vertically sliding windows.
See also: 上げ下げ窓
This old house has double-hung windows.
A double-hung window opens and closes by sliding up and down.
From ギロチン (guillotine) + 窓 (window), referring to the vertical sliding motion resembling a guillotine blade.