1 boil, bubble, churn, ferment, fizz, foam, froth
2 be in a state (informal) be furious, be incensed, be livid, breathe fire and slaughter, foam at the mouth, fume, get hot under the collar (informal) go ballistic (slang, chiefly U.S.) rage, see red (informal) simmer, storm, wig out (slang)