gossipmonger
🇬🇧/ˈɡɒsɪpˌmʌŋɡə(r)/ 🇺🇸/ˈɡɒsɪpˌmʌŋɡər/a person given to gossiping and divulging personal information about others
noun [专属名词] 爱说闲话的人,饶舌人
She's such a gossipmonger that she can't keep any secret to herself. 她是个十足的八卦者,什么秘密都藏不住。