dig some dirt up on (someone) or dig up some dirt on (someone)
to find out something bad about someone
The newspaper worked hard to dig up some dirt on the politician.
Most Valuable Sports Teams in the World
Value: $1.5 billion
1 year change: 92%
Owners: Mikhail Prokhorov, Bruce Ratner
Russian billionaire Mikhail Prokhorov has shopped a stake in the Nets in recent years, but investors aren t willing to meet his asking price for a club that posted the biggest loss in NBA history during the 2013 14 season.