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Phrase(s): Guess what!
Inf. a way of starting a conversation; a way of forcing someone into a conversation. • Alice: Guess what! Bob: I don’t know. What? Alice: I’m going to Europe this summer. Bob: That’s very nice. • John: Guess what! Jane: What? John: Mary is going to have a baby. Jane: Oh, that’s great!
McGrawhill's American Idioms And Phrasal Verbs