oppo research en · NOUN
Etymology
Clipped compound of opposition research.
Meanings
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(US, informal, uncountable) Research into one's opponent's family, friends, and past, which aims to uncover activities or interests which embarrass or discredit them.
And anyway, after all he had discovered, he’d grown deeply concerned by the prospect of a Trump presidency. So he found Democratic donors whose checks would keep his oppo research going strong.
2017, Howard Blum, “How ex-spy Christopher Steele compiled his explosive Trump-Russia dossier”, in Vanity Fair: