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English definition of “lifeblood”

lifeblood

noun [U] uk   /ˈlaɪf.blʌd/ us  
the thing that is most important to the continuing success and existence of something else: Tourism is the lifeblood of Hawaii's economy.Important and essential thingsInformation and messages
(Definition of lifeblood from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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