To boil away, to vaporize; to evaporate or be evaporated by the action of heat. -- To boil over, to run over the top of a vessel, as liquid when thrown into violent agitation by heat or other cause of effervescence; to be excited with ardor or passion so as to lose self-control.
Boil, v. t. 1. To heat to the boiling point, or so as to cause ebullition; as, to boil water.