enough意为“足够的，充足的”，两个enough放在一起，表达的意思更强了，意为“

　　够了；适可而止；停”

　　例句：

　　Stop asking for money! Enough is enough!

　　别要钱了。适可而止吧。

　　I've heard all the complaining from you that I can take. Enough is enough!

　　我已经听了能采纳的你抱怨的所有事。别再说了。