(not) let the grass grow under (your) feet
to not waste time by delaying doing something.
We can't let the grass grow under our feet - we've really got to get going with this project.
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。