Entry from British & World English dictionary
Short for opposition research: they are doing extensive oppo, looking over her public financial records, getting copies of her divorce papers
More example sentences
- The election was only on Sunday but already these oppo guys are at each other's throats.
- Since he's only been in the Senate five years, the GOP oppo team will have less of a record to mine.
- There needs to be greater integration between these campaigns and online volunteers, doing oppo and raising cash.