A long narrow box in which flowers and other plants are grown, placed on an outside windowsill.
- You don't need an elaborate set-up to paint your window box before planting it.
- Lace curtains hung in the windows and just outside, lavender was growing in the window box.
- Charlie asked as Uncle Henry turned to leave, ‘Can she plant some flowers in the window box?’
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Syllabification: win·dow box
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