E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Second Wind (The),
in running. All animals soon after the start get out of breath, but as the body becomes heated, breathing becomes more easy, and endures till fatigue produces exhaustion; this is called the second wind.
That mysterious physical readjustment, known in animals as second breath, came to the rescue of his fainting frame.The Barton Experiment, chap. x.