tenderloin

From tender +‎ loin.

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tenderloin (countable and uncountable, plural tenderloins)

1. The tenderest part of a loin of meat, especially of pork or beef.
2. (dated, US slang) A district of a city where corruption is common, often because the district is devoted to questionable businesses (peep shows, etc) which are easy for police to blackmail and extort.

• (meat): striploin, fillet, eye fillet (beef)
• (neighborhood): red-light district

• filet mignon (beef)