ratfink
/ˈɹætfɪŋk/
Etymology
From rat + fink.
ratfink means an informer or spy; a traitor. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- An informer or spy; a traitor.“The authors have facetiously labeled the contemplated musical as 'Ratfink', after the name of its central character, James J. Ratfink. Its title is not meant in a derogatory sense.”
- A dislikable or contemptible person.“Maxwell—or Maxie, as he was familiarly called by his once and former rat fink girlfriend—lived in a six-story walkup on a narrow street in Calm's Point, […]”
- A strikebreaker.
verb
- To inform on; to betray.“It led to some rather incredible and colourful claims in the submission by the union that the employers had ratfinked on previous agreements.”