get something on someone(redirected from have something on someone)
get (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 haven't got anything on me! If we want to nail him for fraud, we'll need to get 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.
get something on someone
Also, have something on someone. Obtain or possess damaging knowledge about someone. For example, They hoped to get something on the candidate, or Once Tom had something on his boss, he knew he would not be pressured again. [c. 1920] Also see be on to.