inflate

Short definition from Wiktionary

Verb

1. 1
   To enlarge an object by pushing air (or a gas) into it; to raise or expand abnormally
2. 2
   To enlarge by filling with air (or a gas).
3. 3
   To swell; to puff up.
4. 4
   To decompress (data) that was previously deflated.
5. 5
   To represent something as being more important, better, or worse than it actually is; to exaggerate.