Is the phrase "rip right off" an idiom?
No, the expression "rip right off" is not an idiom. The phrase "right off" is an adverbial phrase that means to do something quickly or instantly. When placed after a verb, it means to do that verb instantly. The word "rip" in this context means to remove something quickly. So to "rip right off" here refers to taking off the sweater vest quickly. Ex: He drove right off without saying goodbye. Ex: Take your jacket right off and come inside.
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