have (something) on (someone)

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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.
See also: have, on
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