v. 1 intr. boil, bubble over. 2 intr. be very agitated, esp. with anger (seething with discontent; I was seething inwardly). 3 tr. & intr. archaic cook by boiling. seethingly adv.
[ OE seothan f. Gmc ]
SEETHE
Meaning of SEETHE in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012