1. make bigger (usually using air)
To 'inflate' something means to increase something in size or amount, such as in the phrase 'inflating figures' 'he has an inflated ego' or 'to inflate costs'. It can also mean to fill something with air or gas so that it becomes enlarged such as a floating toy or a tyre. To 'inflate' can also mean 'to exaggerate'. "The statistics were inflated to encourage investment."
I'm not buying a car at such an inflated price. It was only $15,000 last week!
He has such an inflated ego. He thinks he's the best at everything!