second wind

the return of ease in breathing after exhaustion caused by continued physical exertion, as in running.
the energy for a renewed effort to continue an undertaking.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
second wind (wɪnd)
1.  the return of the ability to breathe at a comfortable rate, esp following a period of exertion
2.  renewed ability to continue in an effort

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Cultural Dictionary

second wind definition

A new surge of energy after a period of mental or physical exhaustion: “At the midway mark, the marathoner got her second wind and left the other runners far behind.” The expression refers to the fact that a person's metabolism changes to a more efficient mode during prolonged exercise.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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