sell somebody/buy a pup

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sell somebody/buy a ˈpup

(old-fashioned, British English, informal) sell somebody or be sold something that has no value or is worth much less than the price paid for it: I’m wondering whether this really is a genuine Rolex. Do you think I’ve been sold a pup?The idea behind this idiom seems to be that someone dishonestly sells a young dog with no experience to someone who is expecting a more valuable older trained dog.
See also: buy, pup, sell, somebody