inflate

To enlarge an object by pushing air (or a gas) into it; to raise or expand abnormally

You inflate a balloon by blowing air into it.

When passion's tumults in the bosom rise, / Inflate the features, and enrage the eyes.

To enlarge by filling with air (or a gas).

The balloon will inflate if you blow into it.

To swell; to puff up.

to inflate somebody with pride or vanity

[I]f they find / Some stain or blemish in a name of note, / Not grieving that their greatest are so small, / Inflate themselves with some insane delight, / And judge all nature from her feet of clay, […]

To decompress (data) that was previously deflated.

To represent something as being more important, better, or worse than it actually is; to exaggerate.

Israel routinely claims that the Gaza Ministry of Health, which is run by Hamas, has a tendency to inflate the number of Palestinian casualties in the Gaza Strip.