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Phrase(s): Whoa, Nellie!
Rur. Wait! Stop! • Tom: When I get that money, I’m gonna get me my own place, and then you and I can get married, and— Jane: Whoa, Nellie! When did I say I was going to marry you? • Whoa, Nellie! Did you measure them boards before you started cuttin’ ’em?
McGrawhill's American Idioms And Phrasal Verbs