Etymology
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ratty (adj.)

1856, "resembling a rat;" 1865, "full of rats;" 1867, "wretched, miserable, shabby," from rat (n.) + -y (2). An older word for "resembling a rat" is rattish (1680s).

updated on April 29, 2021

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Definitions of ratty from WordNet

ratty (adj.)
of or characteristic of rats;
ratty (adj.)
showing signs of wear and tear;
a ratty old overcoat
Synonyms: moth-eaten / shabby / tatty
ratty (adj.)
dirty and infested with rats;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.