落地窗

Sash \Sash\, n. [F. ch[^a]ssis a frame, sash, fr. ch[^a]sse a
shrine, reliquary, frame, L. capsa. See {Case} a box.]
1. The framing in which the panes of glass are set in a
glazed window or door, including the narrow bars between
the panes.

2. In a sawmill, the rectangular frame in which the saw is
strained and by which it is carried up and down with a
reciprocating motion; -- also called {gate}.

{French sash}, a casement swinging on hinges; -- in
distinction from a vertical sash sliding up and down.