sour grapes
嫉妒自己得不到的東西，因此貶低或輕視它
口語·形容嫉妒心理
英文釋義
to disparage or belittle something that one desires but cannot have, or is no longer desirable
例句
She said the prize wasn't worth winning, but that's just sour grapes.
典故來源
源自伊索寓言《狐貍與葡萄》，狐貍吃不到葡萄便說葡萄酸，比喻貶低得不到的東西。