Meaning of “see a man about a dog” in the English Dictionary

british dictionary

"see a man about a dog" in British English

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see a man about a dog

UK informal

You might say you have to see a man about a dog when you do not want to say what you are really doing, especially when going to the toilet:

I've just got to see a man about a dog. I'll be back in a minute.

(Definition of “see a man about a dog” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)