1. A city district largely devoted to vice. Synonym: red-light districk.
QUOTE: Charles Panati, Sexy Origins and Intimate Things (1998): ' Manhattan police officer, Alexander Williams, is thought to be responsible for the phrase "tenderloin district." As the story goes: In 1876, Williams was assigned to New York Citys old 29 th precinct, extending from 23 rd Street to 42 nd Street west of Broadway. The vice-ridden area was notorious for its graft and prostitution. Williams liberally helped himself to illegal cash and boasted that his new assignment allowed him to switch from eating cheap, tough chuck steak to expensive tenderloin cuts. Soon, among police, "tenderloin" meant any vice-filled neighborhood where easy cash could be picked up; and, probably because "loin" has sexual connotations, the word "tenderloin district" quickly came to mean an area filled with prostitutes .'
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tenderizing the meat
tenderizing the tube steak