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lifeblood

1 ENTRIES FOUND:
lifeblood /ˈlaɪfˈblʌd/ noun
lifeblood
/ˈlaɪfˈblʌd/
noun
Britannica Dictionary definition of LIFEBLOOD
[noncount]
: the most important part of something : the part of something that provides its strength and energy
literary : a person's blood