exhale

Short definition from Wiktionary

Verb

1. 1
   To expel air from the lungs through the nose or mouth by action of the diaphragm, to breathe out.
2. 2
   To expel (something, such as tobacco smoke) from the lungs by action of the diaphragm.
3. 3
   To pass off in the form of vapour; to emerge.
4. 4
   To emit (a vapour, an odour, etc.).
5. 5
   To draw out; to cause to be emitted in vapour.

Noun

1. 1
   An exhalation.