challenge Verb

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• o dispute especially as being unjust, invalid, or outmoded

• to confront or defy boldly

• to question formally the legality or legal qualifications of

• to arouse or stimulate especially by presenting with difficulties

• to order to halt and prove identity

• to demand as due or deserved

• to administer a physiological and especially an immunologic challenge to (an organism or cell)

• to make or present a challenge

• to take legal exception