first floor
US /ˌfɜːrst ˈflɔːr/
UK /ˌfɜːrst ˈflɔːr/

1.
primeiro andar
the floor of a building at ground level or immediately above the ground floor
:
•
The office is on the first floor.
O escritório fica no primeiro andar.
•
Take the elevator to the first floor.
Pegue o elevador para o primeiro andar.