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Phrase(s): *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.
McGrawhill's American Idioms And Phrasal Verbs
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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.
American Heritage Idioms