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pup

pup /ˈpʌp/ noun
plural pups
pup
/ˈpʌp/
noun
plural pups
Britannica Dictionary definition of PUP
[count]

buy/sell a pup

British, informal + old-fashioned
◊ To buy a pup means to pay too much money for something or to buy something that is worthless. To sell (someone) a pup means to trick someone into paying too much for something or into buying something that is worthless.