noun
a person who prevents others from using something that they do not need or want for themselves
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The farmer scolded his dog for behaving like a dog in the manger, not allowing the other animals to eat.
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Stop being a dog in the manger and share your toys with your little sister.
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Don't be a dog in the manger and hog all the snacks at the party.
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She's like a dog in the manger, always preventing others from enjoying what she doesn't want.