respire

Short definition from Wiktionary

Verb

1. 1
   To breathe in and out successively.
2. 2
   To breathe in and out successively: To recover one's breath or breathe easily following stress.
3. 3
   To take up oxygen and produce carbon dioxide (as animals do), or vice versa (as plants do).
4. 4
   To (inhale and) exhale; to breathe.
5. 5
   To recover hope, courage, or strength after a time of difficulty.

Noun

1. 1
   Rest, respite.