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English definition of “heartbeat”

heartbeat

noun     /ˈhɑːt.biːt/ US  /ˈhɑːrt-/
[C or U] the regular movement or sound that the heart makes as it sends blood around your body: a steady heartbeatThe circulatory system and blood the heartbeat of sth [S] the person or thing that is most important in forming the character of a place, organization, etc. and giving it energy: Keane was the heartbeat of the team.
(Definition of heartbeat noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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