manger

a dog in the manger

someone who keeps something that they do not really want in order to prevent anyone else from having it. Stop being such a dog in the manger and let your sister ride your bike if you're not using it.

See also: dog

dog-in-the-manger

a dog in the manger - someone who keeps something that they do not really want in order to prevent anyone else from having it. The British have a dog-in-the-manger attitude to the island, no longer needing it themselves, but wanting to deny it to others. (always before noun)