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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*one's second wind
1. Lit. one's stabilized breathing after exerting oneself for a short time. (*Typically: get ~; have ~.) John was having a hard time running until he got his second wind. Bill had to quit the race because he never got his second wind.
2. Fig. one's greater or renewed energy and productivity, gained at some time after starting. (*Typically: get ~; have ~.) I usually get my second wind early in the afternoon. Mary is a better worker after she has her second wind.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Restored energy or strength, enabling one to continue an activity or task. For example, I wasn't sure how far they'd get in a week, but now they seem to have gotten their second wind and are making good progress painting the mural . This expression, dating from the late 1800s, was at first (and still is) used for returned ease in breathing after becoming out of breath during physical exertion such as running. It soon began to be applied to nonphysical efforts as well.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012