1 sth new and difficult
ADJ. big, considerable, enormous, great, huge, radical, real, serious, significant, strong | difficult, tough | major, main | fresh, new | exciting, interesting | economic, environmental, intellectual, political, technical, technological Liszt's piano music presents an enormous technical challenge.
VERB + CHALLENGE be, pose, present | face, meet, respond to, rise to, take on/up The gallery has risen to the challenge of exhibiting the works of young artists. He has taken on some exciting new challenges with this job.
CHALLENGE + VERB face sb the challenges facing nurses in casualty
2 that shows that sb refuses to accept sth
ADJ. serious | direct | effective | legal
VERB + CHALLENGE be, present, represent The demonstration represents a direct challenge to the new law.
PREP. ~ to a legal challenge to the president's power
3 invitation to compete
ADJ. leadership, title his title challenge to the heavyweight champion
VERB + CHALLENGE issue, mount plans to mount a leadership challenge within the party | accept, take up I accepted his challenge to a game of chess. | beat off, fight off Our team will have to fight off the challenge from better trained teams.
PREP. ~ from a challenge from the other political party
1 question whether sth is right/true
ADV. directly The newspaper was directly challenging the government's legitimacy. | seriously | effectively She was effectively challenging the whole basis on which society was run. | successfully The story was completely untrue and was successfully challenged in court.
PREP. on She challenged him on his old-fashioned views.
2 invite sb to compete, argue, etc.
ADV. seriously No one has seriously challenged the champion. | successfully, unsuccessfully
PREP. for She was poised to challenge for the party leadership. | to The count challenged him to a duel.