| 1. | to change from a liquid to a gaseous state, producing bubbles of gas that rise to the surface of the liquid, agitating it as they rise. |
| 2. | to reach or be brought to the boiling point: When the water boils, add the meat and cabbage. |
| 3. | to be in an agitated or violent state: The sea boiled in the storm. |
| 4. | to be deeply stirred or upset. |
| 5. | to contain, or be contained in, a liquid that boils: The kettle is boiling. The vegetables are boiling. |
| 6. | to cause to boil or to bring to the boiling point: Boil two cups of water. |
| 7. | to cook (something) in boiling water: to boil eggs. |
| 8. | to separate (sugar, salt, etc.) from a solution containing it by boiling off the liquid. |
| 9. | the act or an instance of boiling. |
| 10. | the state or condition of boiling: He brought a kettle of water to a boil. |
| 11. | an area of agitated, swirling, bubbling water, as part of a rapids. |
| 12. | Also called blow. Civil Engineering. an unwanted flow of water and solid matter into an excavation, due to excessive outside water pressure. |
| 13. | boil down,
|
| 14. | boil over,
|
| 15. | boil off, Textiles.
|

| a painful, circumscribed inflammation of the skin or a hair follicle, having a dead, suppurating inner core: usually caused by a staphylococcal infection. |

"I am impatient, and my blood boyls high." [Otway, "Alcibiades," 1675]Boiler in the steam engine sense is from 1757; boilermaker "shot of whiskey with a glass of beer" is short for boilermaker's delight (1910), strong cheap whiskey, so called in jest from the notion that it would clean the scales from the interior of a boiler.
boil (boil)
n.
A painful, circumscribed pus-filled inflammation of the skin and subcutaneous tissue usually caused by a local staphylococcal infection. Also called furuncle.
Boil
(rendered "botch" in Deut. 28:27, 35), an aggravated ulcer, as in the case of Hezekiah (2 Kings 20:7; Isa. 38:21) or of the Egyptians (Ex. 9:9, 10, 11; Deut. 28:27, 35). It designates the disease of Job (2:7), which was probably the black leprosy.
boil
In addition to the idioms beginning with boil, also see make one's blood boil; watched pot never boils.