ratter

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
noun any of several breeds of terrier developed to catch rats

From rat + -er.

But Jip it was who, scratching at the foot of the slab like a good ratter, made the discovery which led to our final success. — The Voyages of Doctor Dolittle, Lofting, Hugh
You speak of a furrow and a harrow as being the same thing; you talk of the moulting season for cows; and you recommend the domestication of the pole-cat on account of its playfulness and its excellence as a ratter! — Sketches New and Old, Mark Twain

deserter, apostate, renegade, turncoat, recreant

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