to question whether sth is right, legal, etc. 对（某事）表示异议（或怀疑）◆The government's policies have been challenged by the unions. 政府的政策受到工会的质疑。◆He does not like anyone challenging his authority. 他不喜欢有人质疑他的权威。
to compete with sb/sth for the highest position 向（某人／某事）挑战◆The group is trying to challenge Korea Telecom for market leadership. 集团正试图挑战韩国电信公司的市场领导地位。
to test sb's ability and skills, especially in an interesting way 考验（某人的能力和技巧）◆The job doesn't really challenge her. 这项工作不能真正考验出她的能力。◆He always challenges his staff to find new solutions to problems. 他总是要考验他的员工，要求他们找出解决问题的新方法。