1. breathing abnormally fast and deep, often due to anxiety or panic
Usage: medical; present participle of hyperventilate
2. becoming extremely excited or agitated about something
Usage: informal; figurative use

Examples

• She was hyperventilating after running up the stairs.
• The patient began hyperventilating during the panic attack.
• Stop hyperventilating about the test results.
• He started hyperventilating when he saw the spider.
• The media is hyperventilating over the minor scandal.
• Hyperventilating can cause dizziness and tingling.
• She was hyperventilating so badly that she needed a paper bag.