English version

snake oil

From Longman Dictionary of Contemporary Englishsnake oilˈsnake oil noun [uncountable] especially American English informal  1 something that is claimed to be a solution to a problem, but is not effective2 snake oil salesman/peddler
Examples from the Corpus
snake oilFor all his odd and scary views, Buchanan has played the fear card like a snake oil salesman hawking eternal life.Perhaps, when the shouting from snake oil salesmen subsides, our leaders will find a way to forge a bipartisan solution.
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