Baretti: A dictionary of the English and Italian languages
Impugná-re, v. a.
1. to take or lay hold of, seize, gripe, grasp, catch. — la spada, to draw the sword. — la lancia, to couch the lance; 2. to oppose, impugn, attack. — un'opinione,to attack an opinion; 3. to assail, attack, make war upon; 4. to take, elect; s. m. Impugná-tóre,f. Impugná-tríce; adj. Impugná-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
impugnare: to clinch with the fiste. Also to impugne or resist.