to share a common boundary with another country, state, or area
Germany borders nine different countries.
My grandparents' farm borders the national forest.
to put a strip or design along the edge of something
She bordered the quilt with dark blue fabric.
The painter bordered the mural with a thin black line.
to be almost or very nearly something, often something extreme or undesirable
His behavior borders on rudeness.
The heat today borders on unbearable.
