v. 1 question, dispute, defy, object to, take exception to, contest, doubt, call into doubt, call into or to question, impugn I challenge the validity of your accusation 2 invite, dare, summon, call out, provoke The duke was challenged to a duel 3 brave, dare, confront, defy, contest We could challenge criticism with an easy confidence
n. 4 question, dispute, doubt His opinions are open to challenge 5 invitation, dare, summons, provocation, confrontation, defiance; ultimatum An older opponent might not have issued such a challenge 6 problem, demand, stimulation, trial, test: Are you sure that Mr Wilson will be able to meet the challenge of the new position?