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Phrase(s): Oh, sure (someone or something will)!
Inf. a sarcastic expression claiming that someone or something will do something or that something will happen. • Andy: Don’t worry. I’ll do it. Rachel: Oh, sure you will. That’s what you always say. • Bob: I’ll fix this fence the first chance I get. Mary: Oh, sure. When will that be? Next year?
McGrawhill's American Idioms And Phrasal Verbs