get off (your) backside
British & Australian, very informal!
to stop being lazy and start doing something.
It's time the government got off its backside and did something about improving the railways.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。