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.