Define seethe. seethe synonyms, seethe pronunciation, seethe translation, English dictionary definition of seethe. v. seethed , seeth·ing , seethes v. intr. 1. To churn and foam as if boiling. 2. a. To be in a state of turmoil or ferment: The nation see
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a. To be in a state of turmoil or ferment: The nation seethed with rebellion. b. To be violently excited or agitated: I seethed with anger over the insult. See Synonyms at boil1. 3. Archaic To boil. v.tr. Archaic To boil (something). [Middle English sethen, to boil, from ...