call on

US /kɔːl ɑːn/
UK /kɔːl ɑːn/
"call on" picture
1.

chamar, convocar

to ask someone in a formal way to do something

:
The teacher decided to call on a student to answer the question.
O professor decidiu chamar um aluno para responder à pergunta.
The president will call on the nation to unite during this crisis.
O presidente convocará a nação para se unir durante esta crise.
2.

visitar, fazer uma visita a

to pay a brief visit to someone

:
I decided to call on my grandmother after work.
Decidi visitar minha avó depois do trabalho.
We should call on our neighbors to see if they need anything.
Deveríamos visitar nossos vizinhos para ver se eles precisam de algo.