sour grapes

American  

plural noun

1. pretended disdain for something one does not or cannot have.

   She said that she and her husband didn't want to join the club anyway, but it was clearly sour grapes.

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sour grapes British  

noun

1. (functioning as singular) the attitude of affecting to despise something because one cannot or does not have it oneself

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sour grapes Idioms  

1. Disparaging what one cannot obtain, as in The losers' scorn for the award is pure sour grapes. This expression alludes to the Greek writer Aesop's famous fable about a fox that cannot reach some grapes on a high vine and announces that they are sour. In English the fable was first recorded in William Caxton's 1484 translation, “The fox said these raisins be sour.”

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Etymology

Origin of sour grapes

First recorded in 1750–60; in allusion to Aesop's fable concerning the fox who, in an effort to save face, dismissed as sour those grapes he could not reach