"boil" in the noun sense
1. boil, furuncle
a painful sore with a hard core filled with pus
2. boiling point, boil
the temperature at which a liquid boils at sea level
"they brought the water to a boil"
"boil" in the verb sense
come to the boiling point and change from a liquid to vapor
"Water boils at 100 degrees Celsius"
immerse or be immersed in a boiling liquid, often for cooking purposes
bring to, or maintain at, the boiling point
"boil this liquid until it evaporates"
4. churn, boil, moil, roil
"the sea was churning in the storm"
5. seethe, boil
be in an agitated emotional state
"The customer was seething with anger"
Source: WordNet® (An amazing lexical database of English)
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