Doctor Livingstone, I presume

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Doctor Livingstone, I presume

A humorous greeting. The phrase refers to Scottish explorer David Livingstone, who was presumed lost in Africa in the mid-19th century. When reporter H.M. Stanley finally located him, he greeted Livingstone with this now-famous phrase. You must be the gentleman I'm looking for—Doctor Livingstone, I presume?
See also: doctor, presume