palm off

RD Dec., 2010の記事 "Seriously Cheap People" の文中にあった "palm off" なる表現はかなりユニークな表現と思います。
Speaking of food, when Ray Lesser was growing up, his mother and aunt, who lived down the street, struck a deal. "Every Tuesday," he says, "they would trade each other's surplus leftovers and palm them off on us kids as a whole new meal."
"palm off" は慣用句に違いありません。　そこで辞書を見ます。
・Merriam-Webster's Online Dictionary: to dispose of usually by trickery or guile; Please stop trying to palm off your leftovers onto me.
・Dictionary.com: to dispose of by deception, trickery, or fraud; substitute (something) with intent to deceive: Someone had palmed off a forgery on the museum officials.
・Wiktionary: (idiomatic) To sell or dispose of (something) with the intent to deceive; to attempt to pass off a counterfeit or inferior product as genuine.
面白い表現ですね。Wiktionaryには由来の説明を次ぎのように載せていました。
“Palming” an object (as in a playing card) is a type of sleight of hand, secretly removing the desired article and leaving only the undesired one.
なるほど、手品から来た表現なのですね。