1grass 
/ˈgræs, Brit ˈgrɑ:s/ noun
plural grass·es /ˈgræs, Brit ˈgrɑ:s/ noun 1 a [noncount] : plants that have narrow green leaves, that are eaten by cows, sheep, horses, etc., and that are commonly grown on lawns and in gardens
▪ a field of grass ▪ blades/tufts of grass ▪ It's time to mow/cut the grass. [=mow/cut the lawn] ▪ Keep off the grass. [=don't walk on the lawn] — often used before another noun ▪ grass clippings ▪ grass seed ▪ a grass hut/skirt [=a hut/skirt made from grass]
b [count] : a particular type of grass
▪ ornamental grasses ▪ wild grasses 2 [noncount] slang : marijuana
▪ They were smoking some grass. 3 [count] Brit slang : a person who gives information to the police about the criminal activity of other people : a police informer — see also supergrass
▪ a field of grass ▪ blades/tufts of grass ▪ It's time to mow/cut the grass. [=mow/cut the lawn] ▪ Keep off the grass. [=don't walk on the lawn] — often used before another noun ▪ grass clippings ▪ grass seed ▪ a grass hut/skirt [=a hut/skirt made from grass]
b [count] : a particular type of grass
▪ ornamental grasses ▪ wild grasses
▪ They were smoking some grass.
let the grass grow under your feet
: to wait before doing something or to do something slowly — used in negative statements ▪ He has never been one to let the grass grow under his feet. [=he has never been slow about doing things; he gets things done quickly]
put (someone) out to grass
Brit : to force (someone) to leave a job because of old age
▪ I'm not ready to be put out to grass [=put out to pasture] just yet.
▪ I'm not ready to be put out to grass [=put out to pasture] just yet.
the grass is always greener on the other side (of the fence)
— used to say that the things you do not have always seem more appealing than the things you do have
— grass·like /ˈgræsˌlaɪk, Brit ˈgrɑ:sˌlaɪk/ adjective
▪ grasslike vegetation
/ˈgræsˌlaɪk, Brit ˈgrɑ:sˌlaɪk/ adjective ▪ grasslike vegetation
— grassy /ˈgræsi, Brit ˈgrɑ:si/ adjective, grass·i·er; grass·i·est
▪ a grassy field
/ˈgræsi, Brit ˈgrɑ:si/ adjective, grass·i·er; grass·i·est ▪ a grassy field
