RAT

Definitions

1. 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. Coleridge . . . incurred the reproach of having ratted, solely by his inability to follow the friends of his early days. De Quincey.
2. 2. To catch or kill rats.