Meanings
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1
adj
informal, especially US: old, worn, dirty, or in poor condition
He arrived carrying a ratty suitcase with one broken clasp.
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2
adj
informal: annoyed or irritable
Everyone grew ratty after waiting in the heat for an hour.
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3
adj
resembling or characteristic of a rat
A ratty scratching sound came from behind the wall.
Thesaurus
Etymology
Formed from rat + -y. The literal sense means ratlike or associated with rats; the shabby and irritable senses developed through negative associations with the animal.