as green as grass

1. 幼稚的

When she left school and started her first job, she was as green as grass.

她刚走出校门开始工作时非常幼稚。

let the grass grow under one's feet

1. 浪费时间

I want this work done quickly, so don't let the grass grow under your feet!

赶紧办完这件事, 别浪费时间了!

put/turn out to grass

1. 解雇

My uncle's been put out to grass and now has nothing to do all day.

我叔叔被解雇了, 现在整天无所事事。