rat

rat on

verb

Definition of RAT

1

to give information (as to the authorities) about another's improper or unlawful activities <how much—or how little—did the fuzz have to pay you to rat on us?>

Synonyms fink, grass (on) [British slang], inform, rat (on), sing, snitch, split (on) [British], squeak, talk, tell (on)

Related Words betray, give away, turn in; backstab, cross, double-cross, sell (out), two-time; blab, tattle; tip (off)

2

to leave (a cause or party) often in order to take up another <many party operatives ratted on the senator's candidacy once her poll numbers started to slip>

Synonyms desert, rat (on)

Related Words abandon, abdicate, abjure, apostatize, cut off, disown, forsake, quit, reject, renounce, repudiate, spurn; renege; depart, go, leave, withdraw

Near Antonyms adhere (to), cling (to), stick (to or with); cherish, cultivate, foster