on cue
US /ɑn kjuː/
UK /ɑn kjuː/

1.
no momento certo, como esperado
if something happens on cue, it happens just after someone has said or thought that it would happen
:
•
As soon as I mentioned his name, he walked on cue into the room.
Assim que mencionei o nome dele, ele entrou no momento certo na sala.
•
The rain started on cue, just as we were about to leave.
A chuva começou no momento certo, assim que estávamos prestes a sair.