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English definition of “boil (sth) down”

boil (sth) down

phrasal verb with boil     /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 wayPhysical and chemical processes
(Definition of boil (sth) down from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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