speak of the devil
說到曹操，曹操就到
口語·調侃某人突然出現
英文釋義
to mention someone who then appears unexpectedly
例句
Speak of the devil, here comes Tom right when we were talking about him.
典故來源
源自西方古老迷信，認為提及魔鬼名字會招來它，后演變為指被談論者突然出現。