window box (plural window boxes)
- A narrow box filled with earth, placed on a windowsill and used for growing plants.
2013 August 10, “A new prescription”, in The Economist, volume 408, number 8848:
- As the world's drug habit shows, governments are failing in their quest to monitor every London window-box and Andean hillside for banned plants.
- One of the hollows in the sides of a window frame for the weights which counterbalance a lifting sash.