window box
- a long, narrow box on or outside a window ledge, for growing plants
- one of the channels along the sides of a window frame for containing the weights that counterbalance the sash
See window box in American Heritage Dictionary 4
noun- A usually long, narrow box for growing plants, placed on a windowsill or ledge.
- One of the vertical grooves on the inner sides of a window frame for the weights that counterbalance the sash.
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suggestion box