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

1.
说曹操曹操就到
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!
我们刚说到汤姆,说曹操曹操就到,他来了!
•
Oh, speak of the devil, there's Sarah walking towards us.
哦,说曹操曹操就到,莎拉正朝我们走来。