1. express a different opinion to others in order to examine an idea in more detail
let me play devil's advocate for a moment
If you 'play devil's advocate' it means to take a position which is the opposite from everyone else's in a debate or discussion in order to examine things from another perspective. If you 'play devil's advocate' you are trying to anticipate what people might think that have contrasting or opposite views to yourself. Playing 'devil's advocate' allows you to put yourself in the shoes of the opposition and to think like them in order to think of counter-arguments or rebuttals.