decompress

Short definition from Wiktionary

Verb

1. 1
   To relieve the pressure or compression on something.
2. 2
   To bring someone (such as a diver) back to normal atmospheric pressure after being exposed to high pressure.
3. 3
   To restore (compressed data) to its original form.
4. 4
   To adjust to normal atmospheric pressure after being exposed to high pressure.
5. 5
   To relax.