We found 4 dictionaries that define the word second winds:

General (3 matching dictionaries)

1. second winds: Merriam-Webster
2. second winds: Collins English Dictionary
3. second winds: Vocabulary.com

Medicine (1 matching dictionary)

4. second winds: Merriam-Webster Medical Dictionary

(Note: See second_wind as well.)

Definitions from Wiktionary (second wind) ▸ noun:  A renewed feeling of energy after a period of inactivity. ▸ Also see second_wind ▸ Words similar to second winds ▸ Usage examples for second winds ▸ Idioms related to second winds ▸ Wikipedia articles (New!) ▸ Words that often appear near second winds ▸ Rhymes of second winds ▸ Invented words related to second winds