1. [verb] (transitive) To boil.
2. [verb] (intransitive) (of a liquid) To boil vigorously.
3. [verb] (intransitive) (of a liquid) To foam in an agitated manner, as if boiling.
4. [verb] (intransitive) (of a person) (figuratively) To be in an agitated or angry mental state, as if boiling.
5. [verb] (intransitive) (of a place) (figuratively) To buzz with activity.
6. [verb] Be noisy with activity; 'This office is buzzing with activity'.
7. [verb] Be in an agitated emotional state; 'The customer was seething with anger'.
8. [verb] Foam as if boiling; 'a seething liquid'.
9. [verb] Boil vigorously; 'The liquid was seething'; 'The water rolled'.