As a noun:
* The river forms the natural border between the two countries.
* She carefully trimmed the border of the fabric before sewing it.
* The border patrol stopped the car to check the driver's documents.
* The children drew pictures within the borders of the paper.
* The book has a beautiful decorative border around the title page.
As a verb:
* The artist bordered the painting with a gold frame.
* They bordered the garden with a low brick wall.
* The new development will border on the existing park.
As an adjective:
* He wore a border patrol uniform.
* The border states are often politically diverse.
The meaning of "border" can vary depending on the context. Choose the best usage based on what you want to express.