impugnar (ww):
aanvallen(en) question the validity of., bestrijden(en) question the validity of., betwisten(en) question the validity of., loochenen(en) to contradict something said., tegenspreken(en) to contradict something said., weerleggen(en) to contradict something said., weerspreken(en) question the validity of., wraken(en) to make a formal objection to a juror.
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Via: Memodata.com