Puff up

Pronunciation: /ˈpəf ˈəp/

Puff up (verb)

  1. To become bigger because air or gas fills something, or to make it bigger in this way.
  2. To make your body or part of it look larger by moving it outward.
  3. To behave as if you are more important than you really are, often to impress others.

Examples

  • The balloon puffs up when you blow air into it.
  • I puff up the cushion by pressing the valve.