Baretti: A dictionary of the English and Italian languages
Prométt-ere, v. a. (V. mettere,)
1. to promise, engage or give one's word. — in matrimonio,to promise in marriage, betroth; 2. to assure, promise. Vi prometto ch'ella è così, I assure you it is so; 3. to be bail, security; 4. to swear; 5. to threaten, menace. — a piede e a cavallo, to promise in every way; 6. to cause to fear; v. r. to promise one's self, to hope;s. m. Prométt-itóre, f. Prométt-itríce; adj. Prométt-énte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
promettere: or mettúto, to promife, to vow, to answer for.