That expression comes from the days when people slept on beds filled with dried grass or hay.

VOA: special.2009.09.20

This is individual services like teaching piano or cutting someone's grass or a hairstylist.

还有个人服务，比如教钢琴,或是帮别人修剪草坪或是作一个发型师。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

It's for 3 or 4 days and it's put on by a local businessman who's a blue grass freak,

它会持续3到4天，是当地的一名商人赞助的，他是个热爱蓝草的怪人，

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If a test finds that soil has too much lead, you might be advised to remove the soil or cover it with sod grass.

VOA: special.2009.06.09

Some people use grass cuttings or newspapers.

VOA: special.2009.06.30

There are no gravestones or grand mausoleums - just a patch of bare grass surrounded by a simple wooden fence.

VOA: standard.2010.07.22