the.com/challenge
A problem wearing a motivational poster, daring you to win.
means A demanding task or situation that tests your abilities, or a formal call to compete or dispute something.
from From Latin calumnia, meaning false accusation or trickery, via Old French chalenge, an accusation or claim — only later did it soften from courtroom insult into something you proudly accept.
Legal senseYou can challenge a juror, removing them before trial.
Old meaningOnce meant a slanderous accusation, not a noble test.
SportTennis players challenge calls, betting on the camera.