Webster's English Dictionary

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seethe

1. seethe \'se-th\ vb [ME sethen, fr. OE se-othan; akin to OHG siodan to 
   seethe,] Lith siausti to rage 1: BOIL, STEW  2: to soak or saturate in a 
   liquid  archaic  1: BOIL  2a: to be in a state of rapid agitated movement  
   2b: to churn or foam as if boiling  3: to suffer violent internal 
   excitement 
2. seethe n : a state of seething : EBULLITION