1chal·lenge 
/ˈtʃælənʤ/ verb
chal·leng·es; chal·lenged; chal·leng·ing /ˈtʃælənʤ/ verb [+ obj] 1 : to say or show that (something) may not be true, correct, or legal : dispute
▪ A number of doctors are challenging the study's claims. ▪ The new lawsuit challenges the lower court's decision. ▪ The new data challenges many old assumptions. [=the new data gives people reasons to doubt many old assumptions] 2 a : to question the action or authority of (someone)
▪ She's been challenged on her handling of the problem. ▪ None of them were willing to challenge the referee on the call.
b law : to question whether (someone) should serve on a jury
▪ challenge a juror 3 : to test the ability, skill, or strength of (someone or something) : to be difficult enough to be interesting to (someone)
▪ It's a game that will challenge a child's imagination. ▪ The work doesn't challenge him anymore, and he's often bored. 4 : to invite (someone) to compete in a game, fight, etc. — usually + to ▪ I challenge you to a game of chess. ▪ The duke challenged him to a duel. 5 : to order (someone) to stop and prove who he or she is
▪ The sentry challenged the stranger at the gate.
▪ A number of doctors are challenging the study's claims. ▪ The new lawsuit challenges the lower court's decision. ▪ The new data challenges many old assumptions. [=the new data gives people reasons to doubt many old assumptions]
▪ She's been challenged on her handling of the problem. ▪ None of them were willing to challenge the referee on the call.
b law : to question whether (someone) should serve on a jury
▪ challenge a juror
▪ It's a game that will challenge a child's imagination. ▪ The work doesn't challenge him anymore, and he's often bored.
▪ The sentry challenged the stranger at the gate.
— chal·leng·er noun, plural chal·leng·ers [count]
▪ He hopes to be the governor's challenger in the next election. [=the candidate running against the governor] ▪ The boxing match pitted the two-time champion against his challenger.
▪ He hopes to be the governor's challenger in the next election. [=the candidate running against the governor] ▪ The boxing match pitted the two-time champion against his challenger.
