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1.
The act of a buyer negotiating a lower price for goods or services from a seller.
The car dealer wanted me to pay sticker price for my new car, but I successfully Jewed him down to a lower price.
by Maxwell July 17, 2004
 
2.
In video games, most commonly Gears Of War, to kill or down someone in a cheap way.
"I am going to Jew him down with an active reload sniper."
by NodenWIRE April 25, 2007