" ratted (on) "

1: to give information (as to the authorities) about another's improper or unlawful activities;

  * e.g., " ... how much—or how little—did the fuzz have to pay you to rat on us? "

•  Synonyms : 

•  finked,

•  grassed (on),

•  informed,

•  sang,

•  snitched,

•  split (on),

•  squeaked,

•  squealed,

•  talked,

•  told (on)

•  Antonyms : 

• (N/A)

2: to leave (a cause or party) often in order to take up another;

  * e.g., " ... many party operatives ratted on the senator's candidacy once her poll numbers started to slip "

•  Synonyms : 

•  defected (from),

•  deserted

•  Antonyms : 

• (N/A)