tattletale
/ˈtætəlˌteɪl/
noun
- A person, especially a child, who tells an authority figure about someone else's wrongdoing, often to get them in trouble.
- The other kids refused to play with the tattletale who ran to the teacher every five minutes.
- In the story, the tattletale mouse warned the farmer about the fox every time.
- My little brother is such a tattletale — he told Mom I didn't do my homework.
Synonyms
adjective
- Revealing information or secrets; telling on someone.
- The tattletale paint color showed every fingerprint on the wall.
- The dog's tattletale barking alerted us that someone was at the door.
- Her tattletale expression gave away the surprise party plans.