英文：a dog in the manger (n.)
說明：manger 意為「馬槽」，這成語源自《伊索寓言》(Aesop’s Fables)，字面意思為「狗佔馬槽」，指狗本身不吃為馬準備的草料，卻又佔著馬槽不讓馬吃。所以，a dog in the manger 是諷刺那些自私的人佔有某些東西，卻不使用，又不肯與人分享。
例句：
- Don’t be such a dog in the manger! If you don’t want that Barbie doll, give it to Amy. (不要這樣佔著茅坑不拉屎！如果妳不玩那個芭比娃娃，就送給艾美吧)
- Cindy borrowed a lot of books from the library but she didn’t read any of them. She was really a dog in the manger. (辛蒂從圖書館借了很多書，但一本也沒有看過，真是佔著茅坑不拉屎)