challenge (one) on (something)(redirected from challenge them on)
challenge (one) on (something)
To question one, perhaps aggressively, on a particular issue, statement, or viewpoint. I had to challenge him on that remark about sales because the budget report did not support it at all. That is a positively absurd statement, and I'm glad someone challenged her on it. Challenging someone on their political beliefs the first time you meet them is usually not the best idea.