Whenever someone breaks the rules, she tattletales to the teacher without hesitation.

Teachers usually ignore minor squabbles, but they can't stand tattletales who constantly report every small misbehavior.

When Jamie accused Sam of cheating, the other kids labeled him a tattletale, even though he was just trying to be honest.

The tattletale stain on his shirt betrayed his lie.

Don't tattletale about my plans; I wanted to surprise everyone.

When she tattletaled about the missing cookies, everyone in the room stared at Tim.