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challenge [challenged, challenging, challenges]▼(to dispute something)verb[UK: ˈtʃæ.ləndʒ] [US: ˈtʃæ.ləndʒ]
contend [contended, contending, contends]▼(strive in opposition)verb[UK: kən.ˈtend] [US: kən.ˈtend]
impugn [impugned, impugning, impugns]▼(question the validity of)verb[UK: ɪm.ˈpjuːn] [US: ˌɪm.ˈpjuːn]
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