give someone an inch and they'll take a mile idiom saying
得寸进尺
said about someone who has been given a small amount of power or freedom to do something, and then has tried to get a lot more
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。