1. a person who tells on others, especially by reporting their wrongdoing to an authority figure
Usage: informal; often used by or about children

Examples

• Nobody likes a tattletale who runs to the teacher every time someone breaks a rule.
• She called him a tattletale after he told their parents about the broken vase.
• The children avoided playing with the tattletale because they couldn’t trust him.
• Don’t be such a tattletale – handle it yourself first.
• The tattletale in our class always reports when someone talks during quiet time.
• He earned a reputation as the office tattletale for constantly reporting his coworkers’ mistakes.