Blabbermouth informal
Used to refer to a person who talks excessively or carelessly, and tells secrets to others
I couldn't believe in my ear when I heard you told them my secret. You are such a blabbermouth!
He lost her respect for being a blabbermouth. He told others everything she said privately to him.
To tell secrets to other people
I wanted it to be a surprise, but my sister blabbermouthed all my plans.
You shouldn't have told him your secret because he is infamous for blabbermouthing everything.
Used to describe someone who reveals or has permission to share with the public his/her private problem.
The verb "blabbermouth" must be conjugated according to its tense.
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.