a/the devil's advocate

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devil's advocate

One who argues against a cause or position either for the sake of argument or to help determine its validity. For example, My role in the campaign is to play devil's advocate to each new policy before it's introduced to the public . This term comes from the Roman Catholic Church, where advocatus diaboli (Latin for "devil's advocate") signifies an official who is appointed to present arguments against a proposed canonization or beatification. It was transferred to wider use in the mid-1700s.
See also: advocate

a/the devil’s ˈadvocate

a person who argues against something, even though they really agree with it, just to test the arguments for it: Helen doesn’t really think that women shouldn’t go out to work. She just likes to play devil’s advocate.
See also: advocate