seethe

Of a liquid or other substance, or a container holding it: to be boiled (vigorously); to become boiling hot.

[W]hen a pot ſeetheth, if we lade it and moove the liquor up and down, even while it ſeetheth, we ſhall make it quiet.

Deep Hell! that seethest in thy simmering pit; / Thy thousand throned horrors shall not vie, / Or ever compass it!

Of a liquid, vapor, etc., or a container holding it: to foam or froth in an agitated manner, as if boiling.

My bowels ſeeth wͪ in me ⁊ take no reſt, for yͤ dayes of my trouble are come vpõ me.

I obſerue our Ducheſſe / Is ſicke a dayes, ſhe puykes, her ſtomacke ſeethes, […]

Of a person: to be in an agitated or angry mental state, often in a way that is not obvious to others.

I vvill make a complementall aſſault vpon him for my buſineſſe ſeeth's.

[F]or them alone did seethe / A thousand men in troubles wide and dark: […]

Of a place: to be filled with many people or things moving about actively; to buzz with activity; also, of people or things: to move about actively in a crowd or group.

Shock Box was the skankiest bar in Hasted, complete with a cheesy jukebox, cheap pints, and a sweaty club in the basement that seethed every weekend with a superhorny boarding-school crowd.

Of a place: to have inhabitants in an angry or disaffected mood; to be in a state of unrest.

"All the north is seething," said Gerard. "We must contrive to agitate the metropolis," said Maclast, a shrewd carroty-haired paper-stainer.

A state of boiling or frothing; ebullition, seething; hence, extreme heat; much activity.