have on one

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

have something on one('s person)

to carry something about with one. Do you have any money on your person? I don't have any business cards on me.See also: have, on, one