This is the 2281st most frequent Portuguese word.
beira
"Edge," "border," or "shore."
Here, 'beira' is used to denote the edge or border of the river.
A casa fica na beira do rio.
The house is by the riverbank.
In this sentence, 'beira' is metaphorically used to express being on the brink or verge of something important.
Estamos na beira de uma grande descoberta.
We are on the verge of a major discovery.
Here, 'beira' refers to the side or margin of the road.