Definition from macmillandictionary.com
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I was bored with my job and felt I needed a new challenge.
Are western nations ready to meet the enormous environmental challenges that lie ahead?
We were all keen walkers, and enjoyed the challenge of this remote place.
The challenge for policy-makers is to achieve economic growth without damaging the environment.
The new government faces the daunting challenge of completing the building on time.
He began a legal challenge to clear his name.
There seems to be no significant challenge to the party’s free-market ideology.
Recent discoveries pose a serious challenge to accepted views on the age of the universe.
The strike was seen as a direct challenge to the authority of the government.
They have failed to mount a serious challenge to the existing leadership.
Federer returned to make a major challenge for the Wimbledon title.
One of the men issued the challenge, ‘I’ll take on any two of you.’
one of the golfers competing in the Million Dollar Challenge