One of the mysteries of the English language finally explained.
With the. The Prudential Assurance Company. "man from the Pru"noun a representative of the Prudential Assurance Company who deals directly with private clients, especially (originally) one who calls regularly at clients' homes to collect insurance premiums (also in extended use).
1920s; earliest use found in William Collinson (1889–1969). Short for prudential in the name of The Prudential Mutual Assurance Investment and Loan Association (the name of the company has subsequently changed a number of times, but the word Prudential has remained in each case).
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