What is another word for rats on?
Pronunciation: [ɹˈats ˈɒn] (IPA) 
The phrase "rats on" typically implies a negative connotation, meaning to betray or inform on someone. There are a host of synonyms one could use in place of this phrase, including "snitch on," "tattle on," "rat out," or "expose." Other options include "blow the whistle," "squeal," "leak," or "disclose." Each of these synonyms carries its own unique flavor and connotation, so the choice of which to use will depend on the context in which the phrase is being employed. Regardless of the specific word used, "rats on" is a loaded phrase that often implies a breach of trust or ethics.
