The word 'boil away' refers to the process of evaporating liquid by heating it. Some antonyms for the term 'boil away' include 'cool down,' 'freeze,' 'solidify,' 'condense,' and 'liquefy.' Cooling down is the process of reducing the temperature of something. Freezing is the process of changing a liquid into a solid by cooling it to its freezing point. Solidifying refers to the process of changing a liquid or gas into a solid by cooling or removing heat. Condensing is the process of changing a gas or vapor into a liquid. Liquefying is the process of changing a solid into a liquid by heating or pressure. These antonyms illustrate the opposite effects to 'boil away,' which can be useful in understanding other related terms.