Second wind 再次振作起来
Many long-distance runners experience a phenomenon also known as a 'second wind'. A runner may be completely exhausted and unable to continue when they suddenly feel a new surge of energy that allows them to finish the race.
许多长跑运动员会体验到一种被称为 “a second wind 第二春”的现象。运动员可能已经处于筋疲力尽无法继续的状态，但突然间感觉到新一波动力的冲击从而完成比赛。
当我们形容某人有 a second wind 的时候，这就是说他们恢复了精力，再次崛起或继续做什么事情。
I usually feel a bit tired after lunch but get a second wind around 4pm.
Observers said Barack Obama was judged to have lost the first Presidential debate with Republican challenger Mitt Romney, but got a second wind in the second and third debate.
To throw caution to the wind 意思是把顾虑和担忧都抛在脑后，大胆的去做事。有时候也指办事欠考虑。
Sometimes you have to throw caution to the wind and go with your heart. Do what you believe in.
You know what? I'm going to throw caution to the wind and bet all my money on that racehorse. I think it's going to win.