Noun
An organism notable for eating grass
A fish of species Distichodus rostratus or Distichodus engycephalus, of Africa
(figuratively) A police officer who accepts offered bribes but does not actively seek them out.
Alternative form: grasseater
Coordinate term: meat-eater
grass-eater (plural grass-eaters)
(derogatory, slang) A celibate man, especially a Japanese man, who eschews dating and sexual relationships.
Synonym: herbivore man