have something on somebody

have (something) on (one)

1. To have incriminating or unfavorable proof against one, as for some crime, wrongdoing, or misbehavior. Go to the police, for all I care! You don't have anything on me! If we want to nail him for fraud, we'll need to have more on him than a few questionable phone calls.
2. To have a particular advantage over one. You may think you can beat me, but I've got 10 years' experience on you.
3. To currently be in possession of something. Hey, do you have a pen on you? I need to write this down. Yeah, I have a tissue on me.
See also: have, on
Farlex Dictionary of Idioms.

have something ˈon somebody

(informal) have information about somebody which is proof of their criminal activities or which would make them embarrassed if you told other people: The press have got something on him, but for the moment they’re keeping quiet. OPPOSITE: have nothing on somebody (2)
See also: have, on, somebody, something
Farlex Partner Idioms Dictionary
See also:
  • have (something) on (one)
  • have on one
  • get (something) on (someone)
  • get on
  • get something on someone
  • have the goods on (someone)
  • have the goods on someone
  • get the goods on
  • get the goods on (someone)
  • get the goods on someone