Baretti: A dictionary of the English and Italian languages
Rintuzzáre, v. a.
1. to blunt, to dull or take off the edge or point; 2. to push, to beat or force back, to repel or repulse; 3. to lessen, to make less, to diminish, to abate; 4. to alienate, to estrange, to draw away; v. r. to humble or abase one's self.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
rintuzzare: to make blunt, to abate the edge. Also to clinch a naile. Also to dull, to beat downe, to suppresse.