1. difficult tasks or situations that test one’s abilities
2. invitations to compete or fight

1. to question or dispute the truth or validity of something
2. to invite someone to compete or fight
3. to test the abilities of someone or something

Examples

• The math problems presented serious challenges for the students.
• She faces many challenges as a single parent.
• He issued challenges to all the local chess players.
• The lawyer challenges the witness’s testimony.
• The coach challenges his players to improve every day.
• This puzzle really challenges your problem-solving skills.
• The opposition party challenges the new policy.
• Mountain climbing challenges both body and mind.