keep my edge = stay sharp

意思是某人保持最好的状态，俚语中常用哦。

例句：

I have to speak English every day just in order to keep my edge.

为了我英语一直好下去，我每天都练习口语。

相反的，lose your edge 意思是不在状态，状态不好。

例句：

David Beckham is a great soccer player but if he doesn’t practice every day, he’ll lose his edge.

贝克汉姆是位伟大球员，如果他不每天练球的话他就会失去他的战斗力。