This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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someone who prevents others from doing what they themselves do not want to do (in Aesop's Fables a dog that cannot eat hay lays in the hayrack and prevents the other animals from eating the hay)
My friend always acts like a dog in the manger and often tries to prevent us from enjoying ourselves.