From Longman Dictionary of Contemporary Englishdevil's advocateˌdevil’s ˈadvocate noun [countable] someone who pretends to disagree with you in order to have a good discussion about something He would play devil’s advocate with anyone.
Examples from the Corpus
devil's advocate• He is not a negotiator or a devil's advocate.• Well, he's entitled to play devil's advocate.• Somehow you have to play devil's advocate against your presentation and try to knock it to pieces.• Afterwards I continue to argue for rugby, feeling ever more like the devil's advocate.• Often the interviewer will need to play the devil's advocate, to put the other side's case forward.• Perhaps he should try to play the devil's advocate?play devil’s advocate• Well, he's entitled to play devil's advocate.• Somehow you have to play devil's advocate against your presentation and try to knock it to pieces. 