grass-eater

The English word “grass-eater” has 4 meanings listed here.

noun

An organism notable for eating grass
A fish of species Distichodus rostratus or Distichodus engycephalus, of Africa
A police officer who accepts offered bribes but does not actively seek them out.
A celibate man, especially a Japanese man, who eschews dating and sexual relationships.

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

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.