second wind

A renewed energy after a period of fatigue. I planned to stop working at 9, but then I got my second wind and just kept going. I'm sorry, but if I don't get a second wind soon, I'm going to bed.

a second wind

If you get a second wind when you are tired or unsuccessful, you suddenly feel energetic or determined again and can continue and succeed in what you are doing. I was weary and my legs were feeling heavy. Then, suddenly, midway through the fourth set, I got a second wind. On the way back to the house, I found a second wind and decided to go and visit Charlie. Note: If runners who are out of breath get their `second wind', their breathing becomes easier and they are able to continue.