challenge

US /ˈtʃæl.ɪndʒ/
UK /ˈtʃæl.ɪndʒ/
"challenge" picture
1.

a call to someone to participate in a competitive situation or fight to decide who is superior in terms of ability or strength

:
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He accepted the challenge to a duel.
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The team issued a challenge to their rivals.
:
dareprovocationsummonsgauntlet
2.

a difficult task or problem; something that tests one's ability or resources

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Learning a new language is a real challenge.
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The project presented many technical challenges.
:
difficultyobstacleproblemtesthindrance
1.

to invite someone to engage in a contest or competition

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He decided to challenge the champion to a boxing match.
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The new company aims to challenge the market leader.
:
daredefycontestdisputequestion
2.

to dispute the truth or validity of something

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The lawyer decided to challenge the evidence presented in court.
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She often likes to challenge conventional wisdom.
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disputequestiondoubtobject todefy
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challengingchallenger