seethe

Concise Oxford English Dictionary © 2008 Oxford University Press:
seethe/siːð/

▶verb

• 1 (of a liquid) boil or be turbulent as if boiling.

  ■ archaic cook (food) by boiling.

• 2 be filled with intense but unexpressed anger.

• 3 be crowded with people or things moving about in a rapid or hectic way.

– derivatives
seething adjective,
seethingly adverb.

– origin OE sēothan ‘make or keep boiling’.