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English definition of “lifeblood”

lifeblood

noun [S]     /ˈlaɪfblʌd/
the most important thing that someone or something needs in order to continue to exist or operate: Education is the lifeblood of a knowledge-based economy. She is fantastic at new product development, which is our lifeblood.
(Definition of lifeblood noun from the Cambridge Business English Dictionary © Cambridge University Press)
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