One of the mysteries of the English language finally explained.
Allusively: the London Stock Exchange; London Stock Exchange members or traders collectively; the financial sector of the City of London in general.
Late 19th century; earliest use found in The Pall Mall Gazette. From Throgmorton Street, the name of a street in the City of London, where the Stock Exchange was formerly located.
Throgmorton Street/ˈθrɒɡmɔːtn striːt//θrɒɡˈmɔːtn striːt/
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