challengechallengechallengeschallengedchallenging2verb (challenges, challenging, challenged)1to refuse to accept a set of rules; to say that you think somebody or something is wrong: She does not like anyone challenging her authority.2to ask somebody to play a game with you or fight with you to see who wins: The boxer challenged the world champion to a fight.challengechallengechallenges1noun1a new or difficult thing that makes you try hard: Climbing the mountain will be a real challenge.2an invitation to fight or play a game against somebody