drop window
- a window with a sash that slides into a space below the sill.
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Origin of drop window
First recorded in 1900–05
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for drop window
Historical Examples
A shelf or counter can be fitted inside the drop-window for the display of your wares.
Woodworking for BeginnersCharles Gardner Wheeler