dog in the manger
From a Greek fable about a dog preventing other animals from eating the hay in a manger, even though as a carnivore it could not eat the hay itself. Although the story was ascribed to Aesop's Fables in the 15th century, no ancient source does so.
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- (idiomatic) Someone who denies to others something that he or she cannot use.
one who denies to others something that he or she cannot use