dog in the manger
自己不想要或者不需要，但是也不供给别人使用的东西
口语·讽刺自私占有
英文释义
someone who selfishly prevents others from using or enjoying something that they themselves have no use for
例句
He won't use the tools but won't let others borrow them—such a dog in the manger.
典故来源
源自伊索寓言：狗躺在马槽里，自己不吃干草，却阻止马吃。