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see a man about a dog

informal

Definition

Someone might say they have to see a man about a dog when they do not want to tell you what they are really doing, especially when they are going to the toilet: I've just got to see a man about a dog. I'll be back in a minute.Urine and urinatingBodily fluids and their productionExcrement and its excretion
(Definition of see a man about a dog from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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