Meaning of “boil (sth) down” in the English Dictionary

"boil (sth) down" in British English

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boil (sth) down

phrasal verb with boil uk /bɔɪl/ us /bɔɪl/ verb

to heat a liquid or food so that part of it is turned into gas and its amount is reduced, or to be reduced in this way

(Definition of “boil (sth) down” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)