[seethe] vb seethed ; seeth.ing [ME sethen, fr. OE seothan; akin to OHG siodan to seethe] vt (bef. 12c) 1 archaic: boil, stew
2: to soak or saturate in a liquid ~ vi 1 archaic: boil
2. a: to be in a state of rapid agitated movement b: to churn or foam as if boiling
3: to suffer violent internal excitement
[2]seethe n (1816): a state of seething: ebullition