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rat2 past tense and past participle ratted, present participle ratting [intransitive] informal
1 if someone rats on you, they tell someone in authority about something wrong that you have done [= grass on]
2 British English to not do what you had promised to do [= go back on, renege on]
rat on 
He accused the government of ratting on its promises to the disabled.
He accused the government of ratting on its promises to the disabled.rat somebody ↔ out
You can't rat out your teammates.
