Boil v. i. [imp. & p. p. Boiled p. pr. & vb. n. Boiling.]
 1. To be agitated, or tumultuously moved, as a liquid by the generation and rising of bubbles of steam (or vapor), or of currents produced by heating it to the boiling point; to be in a state of ebullition; as, the water boils.
 2. To be agitated like boiling water, by any other cause than heat; to bubble; to effervesce; as, the boiling waves.
    He maketh the deep to boil like a pot.   --Job xii. 31.
 3. To pass from a liquid to an aëriform state or vapor when heated; as, the water boils away.
 4. To be moved or excited with passion; to be hot or fervid; as, his blood boils with anger.
    Then boiled my breast with flame and burning wrath.   --Surrey.
 5. To be in boiling water, as in cooking; as, the potatoes are boiling.
 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.