There are 2 definitions of oppo in English:

oppo1

Line breaks: oppo
Pronunciation: /ˈɒpəʊ
 
/

noun (plural oppos)

British informal
  • A colleague or friend: an old oppo of mine
    More example sentences
    • The story line has Carlyle fighting for survival in MI5 after a row with her oppo in France.
    • We could have stayed longer but we had some oppos waiting shoreside and they wanted to continue the dockyard tour.
    • However, she was caught one night after hours trying to get back into barracks - her oppo had failed to unlatch the window.

Origin

1930s: abbreviation of opposite number.

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Word of the day milord
Pronunciation: məˈlôrd
noun
used to address an English nobleman

There are 2 definitions of oppo in English:

oppo2

Line breaks: oppo
Pronunciation: /ˈɒpəʊ
 
/

noun

US
  • 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.

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Word of the day milord
Pronunciation: məˈlôrd
noun
used to address an English nobleman