challenge
Example Sentences
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As solar panels lose their ability to generate electricity after sunset, one major challenge remains for renewable energy: how to store solar power for use later, whether during cloudy weather or overnight.
From Science Daily • May 15, 2026
The victims contacted the police following publicity around a parole board panel decision that he was ready for release that was ultimately overturned after a legal challenge by two of his victims.
From BBC • May 14, 2026
Security has always been a very important challenge in Colombia, and we have to keep working on that.
From Barron's • May 14, 2026
“Brothers Irad and José Luis Ortiz accepted the challenge of participating in the ‘Caribbean Grand Champion’ tournament with a single goal: to become undisputed champions,” the post read in Spanish.
From Los Angeles Times • May 14, 2026
She was Seven Nightshade Salazar, and there hadn’t been a challenge she’d backed down from yet.
From "Witchlings" by Claribel A. Ortega
Vocabulary lists containing challenge
List 2
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The SAT: Language of the Test, List 4
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Academic Vocabulary Toolkit 1, Words 11-20
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