GNU Collaborative International Dictionary of English

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1.       
   Rat, v. i. [imp. & p. p. Ratted; p. pr. & vb. n. Ratting.]
   1. In English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union.
   
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   Coleridge . . . incurred the reproach of having ratted, solely by his inability to follow the friends of his early days. De Quincey.
   
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   2. To catch or kill rats.
   
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   2. To be an informer (against an associate); to inform (on an associate); to squeal; -- used commonly in the phrase to rat on.
   
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