Sentence:  Vera is a kindergarten student who loves to be the center of adult attention. She has a quick temper and frequently talks out in class. She also frequently "<WSD>tattles</WSD>" on other students. 
Meaning of the word marked with <WSD> tags:  (to report others' wrongdoings or violations) "Often said of children": to report incriminating information about another person, or a person's wrongdoing; to tell on somebody. (from late 15th c.)