grass-eater

Meanings

1. An organism notable for eating grass
2. A fish of species Distichodus rostratus or Distichodus engycephalus, of Africa
3. A police officer who accepts offered bribes but does not actively seek them out.

1. A celibate man, especially a Japanese man, who eschews dating and sexual relationships.

Etymology

From grass + eater; applied to bribe-accepting polics by the Knapp Commission in the 1970s.