커피를 끓이다.

The Korean phrase '커피를 끓이다' (keopireul kkeurida) combines two main elements: '커피' (keopi) meaning 'coffee' and '끓이다' (kkeurida) meaning 'to boil' or 'to heat to boiling point'. '커피' (keopi) is a direct loanword from the English word 'coffee'. The adoption of this term into Korean reflects the global spread of coffee consumption and the beverage's introduction to Korea, likely through Western influence. Loanwords from English are very common in modern Korean, especially for foreign concepts, products, and foods. '끓이다' (kkeurida) is a native Korean verb. It is a causative form of the verb '끓다' (kkeulta), which means 'to boil' (intransitive, e.g., water boils). The suffix '-이' (-i-) is a common causative marker in Korean, transforming an intransitive verb into a transitive one, meaning 'to cause to boil' or 'to boil something'. Therefore, '끓이다' specifically implies the action of making something boil, or bringing it to a boiling state. Historically, the preparation of beverages by boiling water with ingredients is a long-standing practice in Korea, as seen in traditional teas and herbal infusions. When coffee was introduced, the existing linguistic framework for preparing hot beverages was naturally applied. The act of making coffee often involves heating water to a boiling point and then either pouring it over coffee grounds or brewing the grounds directly in hot water, thus the verb '끓이다' perfectly encapsulates this process. While coffee making can involve various methods (e.g., drip, espresso), the phrase '커피를 끓이다' broadly refers to the act of preparing coffee, particularly in contexts where heating water is a central step, or more generally, the act of 'making' or 'brewing' coffee. The phrase has been in common use since coffee became popular in Korea, particularly in the 20th century. The cultural integration of coffee as a daily beverage has solidified this phrase as the standard way to express 'to make coffee' or 'to brew coffee' in Korean.