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heartbeat

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heartbeat/ˈhɑɚtˌbiːt/noun
pluralheartbeats
heartbeat
/ˈhɑɚtˌbiːt/
noun
pluralheartbeats
Learner's definition of HEARTBEAT  
[count]
: the action or sound of the heart as it pumps blood

in a heartbeat

US, informal
: in a very brief time: without any delay or hesitation
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