1. to release air or gas from something, causing it to become smaller or flatter
2. to reduce someone’s confidence, enthusiasm, or pride
3. to reduce in size, importance, or value

Examples

• The balloon slowly deflates as air escapes through the small hole.
• She deflates the air mattress before packing it away.
• His harsh criticism deflates her excitement about the project.
• The coach’s negative comments deflate the team’s morale.
• The scandal deflates the politician’s reputation.
• Bad reviews deflate the movie’s box office expectations.
• The tire deflates completely after hitting the sharp rock.