get down on someone

get down on (someone or something)

To have or express negative or overly critical feelings toward someone or something. I don't know why you get so down on Robert, he's such a nice guy to everyone! Don't get so down on this vacation to your grandparents' farm. I know it's not very exotic, but we'll still have a great time!
See also: down, get, on
Farlex Dictionary of Idioms.

get down on someone

in. to be critical of someone; to get on someone’s case. Don’t get down on me. I didn’t do it!
See also: down, get, on, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • be down on (someone or something)
  • a hard head
  • pixel peeper
  • buddy up
  • bring (one) back to reality
  • bring back to reality
  • have (one's)/a beady eye on (someone or something)
  • keep (one's)/a beady eye on (someone or something)
  • keep a beady eye on somebody/something
  • big bully