have a down on someone/something

have a down on someone/something

or

have a downer on someone/something

BRITISH
If you have a down on someone or something or you have a downer on them, you do not like them or you disapprove of them. Snobs would have a down on a man with a south London accent. For some reason Jackie has always had a downer on me.
See also: down, have, on, something