To renege on an agreement. While this phrase is derived from the stereotype of the shrewd Jewish businessperson, it is used more broadly to describe the behavior of anyone who engages in artifice. This phrase is considered inappropriate for polite company because of its divisive origin.
Quoting from Quentin Tarantino's film Kill Bill vol. 2: "I don't dodge guilt, and I don't Jew out of paying my comeuppance."
Verb. To talk down in price or counter offer, even after a set price has been agreed upon weeks or months ago. To whine and plead for partial or full refund of a monetary unit.
"Jim Rosenburg called again this week and tried to jew me out of another $1,500 even though we finished his remodelling months ago."