boil away To pass off as vapor, especially when heated: evaporate, vaporize, volatilize. SeeSOLID. boil down To reduce in complexity or scope: simplify. SeeINCREASE, SIMPLE. boil over To be or become angry: anger, blow up, bristle, burn, explode, flare up, foam, fume, rage, seethe. Informal :steam. Idioms: blow a fuse, blow a gasket, blow one's stack (or top) , breathe fire, fly off the handle, get hot under the collar, hit the ceiling (or roof) , lose one's temper, see red. SeeFEELINGS.
