Definition from macmillandictionary.com
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No one has challenged the assumptions that are made in the report.
This decision is likely to be challenged by the oil companies.
They’re not likely to challenge us on any of the details.
We challenged the company to prove that its system was safe.
The president has accused the provincial government of challenging his leadership.
The girls challenged the boys to a cricket match.
My present job doesn’t really challenge me.
It is a problem that has intrigued and challenged me for many years.
We were immediately challenged by armed guards.