1. A polite greeting or farewell used in the evening or at night, addressed to a group of people
As he left the gathering, he said 'good night to everyone' with a wave.
Ao sair da reunião, ele disse 'boa noite a todos' com um aceno.
2. A formal or courteous way to wish a group a peaceful evening or night
The teacher said 'good night to everyone' as the students left the classroom.
A professora disse 'boa noite a todos' enquanto os alunos saíam da sala.