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Definition of lifeblood noun from the Oxford Advanced Learner's Dictionary

lifeblood

noun
 
/ˈlaɪfblʌd/
 
/ˈlaɪfblʌd/
[uncountable]
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  1. lifeblood (of something) the thing that keeps something strong and healthy and is necessary for successful development
    • Tourism is the lifeblood of the city.
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  2. (literary) a person’s blood, when it is thought of as the thing that is necessary for life
    • The wound was draining the lifeblood from him.
See lifeblood in the Oxford Advanced American Dictionary
previously
adverb
 
 
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