second wind is a noun meaning "renewed energy or strength to continue an undertaking". It carries 2 recorded senses.
renewed energy or strength to continue an undertaking
“She had dinner and got a second wind to finish painting”
“the employers, initially taken by surprise at the pace of developments, regained their second wind”
the return of relatively easy breathing after initial exhaustion during continuous exertion
Definitions, synonyms and semantic relations for second wind come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.