Meaning of the word "a dog in the manger" in English

What does "a dog in the manger" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a dog in the manger

US /ə dɔɡ ɪn ðə ˈmeɪndʒər/
UK /ə dɒɡ ɪn ðə ˈmeɪndʒər/
"a dog in the manger" picture

Idiom

a person who prevents others from using something that they themselves cannot use or do not need

Example:
Don't be a dog in the manger; if you're not going to read the book, let someone else borrow it.
He's being a dog in the manger by refusing to let anyone use his old tools, even though he doesn't need them anymore.