second wind (w?nd)n.1. The return of relative ease of breathing after the initial exhaustion that occurs during continued physical exertion.2. Restored energy or strength.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.second wind (w?nd) n1. (Physiology) the return of the ability to breathe at a comfortable rate, esp following a period of exertion2. renewed ability to continue in an effortCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014sec?ond wind? (w?nd) n. 1. the return of ease in breathing after exhaustion caused by continued physical exertion, as in running. 2. the energy for a renewed effort to continue an undertaking. [1895?1900] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.