a line separating two countries, administrative divisions, or other areas
Panama's western border with Costa Rica
border controls
the edge or boundary of something, or the part near it
the northern border of their distribution area
the unknown regions at the borders of physics and electronics
a decorative strip around the edge of something
she stitched a border on to one of the plain white saris
(of a country or area) be adjacent to (another country or area)
regions bordering Azerbaijan
the states bordering on the Black Sea
come close to or be developing into (an extreme condition)
Sam arrived in a state of excitement bordering on hysteria