Baretti: A dictionary of the English and Italian languages
Oscurá-re, v. a.
1. to obscure, darken; 2. (fig.)to tarnish (as the reputation); v. n. & r. to become dark or obscure, to grow gloomy; s. m.Oscurá-tóre , f. Oscurá-tríce; adj. Oscurá-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
oscurare: to obscure, to darken, to dim, to hide, to keepe in silence from the knowledge of men. Also to make of no fame or reputation.