Baretti: A dictionary of the English and Italian languages
Tuffá-re, v. a.
1. to dip, duck, immerse, plunge;v. r. to plunge, dive, rush into. — in qualche disgrazia, to run one's self into misfortunes. — nel vino, to drink wine immoderately; 2. to go down, set (as the sun); s. m. Tuffá-tóre, f. Tuffá-tríce;adj. Tuffá-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
tuffare: to diue, to ducke or plunge vnder water. Also to dampe or stiftle.