Wiktionary
get some air
alt. (context idiomatic English) To invigorate oneself by breathing refreshing outdoor air, especially after departing from a building or other enclosed space for this purpose. vb. (context idiomatic English) To invigorate oneself by breathing refreshing outdoor air, especially after departing from a building or other enclosed space for this purpose.
Usage examples of "get some air".
Thumbing open the top button of his shirt, Chapel billowed the fabric to get some air.