inflate

verb

• 1fill (a balloon, tire, or other expandable structure) with air or gas so that it becomes distended.
• [no object] become distended by being filled with air or gas.

• 2increase (something) by a large or excessive amount:objectives should be clearly set out so as not to duplicate work and inflate costs
• exaggerate:numbers have been grossly inflated by the local press
• bring about inflation of (a currency) or in (an economy).