**Sill** — a flat surface that supports and separates something or acts as a base for something.
1. I accidentally stepped on a **sill** and woke up my sleeping cat.
2. The window **sill** was covered with dust and needed to be cleaned.
3. The flower pot fell off the **sill** and broke.
4. The house had a beautiful wooden **sill** that added warmth to the interior.
5. The builders installed a new **sill** for the window to ensure proper support.
6. The **sill** of the door was too high for children to open without help.
7. The artist placed his canvas on the **sill** to work on his painting.
8. The **sill** under the kitchen window was used as a place to put plants.
9. The **sills** of the stairs were made of marble, giving the building a luxurious look.
10. The **sill** of the greenhouse was made of glass to allow sunlight to enter.