Keep one's edge 保持某人最好的状态；维持优势
lose one's edge 失去最好的状态；失去优势
1.I have to speak English every day just in order to keep my edge.
2.If he doesn't practise everyday, he will lose his edge.
We have to get to the bakery early, before all the donuts are sold out! If you snooze, you lose!