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.
- To change from a liquid to a vapor by the application of heat: All the water boiled away and left the kettle dry.
- To reach the boiling point.
- To undergo the action of boiling, especially in being cooked.
- To be in a state of agitation; seethe: a river boiling over the rocks.
- To be stirred up or greatly excited: The mere idea made me boil.
- To vaporize (a liquid) by the application of heat.
- To heat to the boiling point.
- To cook or clean by boiling.
- To separate by evaporation in the process of boiling: boil the maple sap.
- The condition or act of boiling.
- Lower Southern U.S. A picnic featuring shrimp, crab, or crayfish boiled in large pots with spices, and then shelled and eaten by hand.
- An agitated, swirling, roiling mass of liquid: "Those tumbling boils show a dissolving bar and a changing channel there” ( Mark Twain).
- boil down To reduce in bulk or size by boiling.
- boil down To condense; summarize: boiled down the complex document.
- boil down To constitute the equivalent of in summary: The scathing editorial simply boils down to an exercise in partisan politics.
- boil over To overflow while boiling.
- boil over To lose one's temper.
- A painful, circumscribed pus-filled inflammation of the skin and subcutaneous tissue usually caused by a local staphylococcal infection. Also called furuncle.