Definitions

1. noun

a person who talks excessively and foolishly about something, especially about trivial matters

“He became a blabber at the party and wouldn’t stop talking about his cat.”

2. verb

to talk or speak excessively and foolishly, often about trivial matters

“She loves to blabber on the phone for hours about her personal life.”

3. verb

to reveal confidential or sensitive information, especially by talking excessively

“The company’s employee blabbered about the new project to the press.”