speak of the devil
US /spiːk əv ðə ˈdɛvəl/
UK /spiːk əv ðə ˈdɛvəl/

1.
falando no diabo, falando no rei de Roma
said when a person you have just been talking about unexpectedly appears
:
•
We were just talking about Tom, and speak of the devil, here he comes!
Estávamos a falar do Tom, e falando no diabo, ele aparece!
•
Oh, speak of the devil, there's Sarah walking towards us.
Oh, falando no diabo, lá vem a Sarah a andar na nossa direção.