have (something) on (someone)(redirected from have on him)
have (something) on (someone)
1. To have incriminating or unfavorable proof against someone, 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 someone. You may think you can beat me, but I've got 10 years' experience on you.