cheese eater

noun

, Slang.

1. an informer; rat.
2. a person who betrays, denies, or abandons their associates, social group, beliefs, etc.

Word History and Origins

Origin of cheese eater¹

An Americanism dating back to 1870–75; the sense “informer”; in association of cheese with rat

Example Sentences

A Greek author has described the Crow as a cheese-eater—but that's a fable.

From Project Gutenberg