rat somebody ↔ out
From Longman Dictionary of Contemporary Englishrat somebody ↔ out American English informalif someone rats you out, they are disloyal to you, especially by telling someone in authority about something wrong that you have done You can’t rat out your teammates. → rat→ See Verb tableExamples from the Corpusrat out• Magic shop in Plantation, the rat stock sells out nearly before it hits the shelves.• Giant amphipods, the size of rats, appear out of nowhere to nibble on the remains.• When they blast, the rats jump out of the sewers and then dive back in again.