1. To boil.
  2. To boil vigorously.
  3. To foam in an agitated manner, as if boiling.
  4. To be in an agitated or angry mental state, as if boiling.
  5. To buzz with activity.

The above text is a snippet from Wiktionary: seethe
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!