Baretti: A dictionary of the English and Italian languages
Sommérg-ere, v. a. (V. mergere,)
1. to sink down, submerge; 2. to bury. Far —, (met.) to overpower, overcome, conquer; v. n. to drown, sink to the bottom; s. m. Sommérg-itóre, f. Sommérg-itríce; adj. Sommérg-énte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
sommergere: to diue, to ducke, to plunge, to sinke or drowen in water.