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Phrase(s): What’ll it be? [and] Name your poison.; What’ll you have?; What’s yours? Inf. What do you want to drink?; What do you want?; How can I serve you? (Typically said by a bartender or bar waiter or waitress.) • Tom: What’ll it be, friend? Bill: I’ll just have a ginger ale, if you don’t mind. • Waitress: What’ll you have? Bob: Nothing, thanks.
McGrawhill's American Idioms And Phrasal Verbs