tell on someone
infml— phrasal verb with tell us/tel/verb past tense and past participle told /toʊld/
to give information about someone's bad behavior or secrets:
If you don’t stop hitting, I’m going to tell on you.
英语词典包含110679条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。