To be in a state of agitation or anger. She began to seethe with frustration when she realized her project had been deleted.
To boil or be in a state of turmoil. The pot began to seethe as the water reached a rolling boil.
To be crowded or teeming with moving creatures or people By midday, the narrow streets were seething with shoppers and street vendors.
(Archaic) To cook or steep something in boiling or simmering liquid The healer seethed the herbs in water to prepare the remedy.