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lifeblood

noun [U]
 
 
/ˈlaɪf.blʌd/

Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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