This is the 379th most frequent Italian word.
bordo
"Border," "edge," or "on board."
Here, 'bordo' refers to the edge or boundary of a physical object.
Il libro è sul bordo del tavolo.
The book is on the edge of the table.
Here, 'bordo' is used in the expression 'a bordo', indicating being on or inside a transportation vehicle.
I passeggeri sono saliti a bordo dell'aereo.
The passengers boarded the airplane.
In this example, 'bordo' refers to the side or edge of a road.