The new data 'challenges' many old assumptions. [=the new data gives people reasons to doubt many old assumptions]
He hopes to be the governor's 'challenger' in the next election. [=the candidate running against the governor]
The coach is confident that you will 'rise to the challenge'. [=the coach is confident that you will succeed]
(..) a comfortable bloody chariot! What you have to learn, Ivar, is that if you break up this brotherhood, we shall not succeed. We have many challenges ahead of us. So, if you want to keep arguing and whining like a little girl, then I suggest you leave. We don't need you. IVAN: Oh, but you do need me. (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19